Beginner Friendly Lithium Battery Capacity Test Method
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- Опубліковано 4 лют 2020
- $26 capacity tester that is beginner friendly (sponsored links): s.click.aliexpress.com/e/_siQ5oZ
It is $45 on amazon: amzn.to/36UqbyE
$10 85A Capacity tester: s.click.aliexpress.com/e/_seFLrJ
Capacity Shunts for your system (and hall effect sensor): www.mobile-solarpower.com/bat...
This video was NOT sponsored, and I bought all of the testers above with my own money.
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AmpereTime
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Renogy
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FTC Disclosure Statement and Disclaimers:
Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :)
DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
Does off-grid solar confuse you? Check out my DIY friendly website for solar system packages and product recommendations, and so much more! www.mobile-solarpower.com
Join our DIY solar community! #1 largest solar forum on the internet for beginners and professionals alike: www.diysolarforum.com
Check out my best-selling, beginner-friendly 12V off-grid solar book (affiliate link):
amzn.to/2Aj4dX4
If DIY is not for you, but you love solar and need an offgrid system, check out Tesla Solar. Low prices and great warranty, and they can take your entire house offgrid with their new Powerwalls: ts.la/william57509
~~~~~~~~~~~~~~~~~~~~~~~~~
My solar equipment recommendations (Constantly updated! Check here first):
12V/48V Lithium Batteries: www.mobile-solarpower.com/solar-batteries.html
Solar System Component Directory: www.mobile-solarpower.com/solarcomponents.html
Plug-N-Play Systems: www.mobile-solarpower.com/full-size-systems.html
Complete 48V System Kits: www.mobile-solarpower.com/complete-48v-solar-kits.html
DIY Friendly Air Conditioner/ Heat Pumps: www.mobile-solarpower.com/solar-friendly-air-conditioners.html
Complete 48V System Blueprint: www.mobile-solarpower.com/48v-complete-system-blueprint.html
~~~~~~~~~~~~~~~~~~~~~~~~~~
My Favorite Online Stores for DIY Solar and Coupon Codes:
-Current Connected: SOK, Victron and High Quality Components. Best prices and warranty around: currentconnected.com/?ref=wp
-Signature Solar: Cheap Server Rack Batteries and Large Solar Panels:
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-Ecoflow Delta Official Site: My favorite plug-n-play solar generator:
us.ecoflow.com/?aff=7
-AmpereTime: Cheapest 12V batteries around:
amperetime.com/products/ampere-time-12v-100ah-lithium-lifepo4-battery?ref=h-cvbzfahsek
-Rich Solar: Mega site and cheaper prices than renogy! Check them out:
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-Shop Solar Kits: Huge site with every solar kit you can imagine! Check it out:
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-Watts 24/7: Best deals on all-in-one solar power systems, with customer support and distribution here in the USA:
watts247.com/?wpam_id=3
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Contact Information:
I am NOT available for personal solar system consult! If you wish to contact me, this is my direct email: williamprowsediysolar@gmail.com
Join the forum at diysolarforum.com/ if you wish to hang out with myself and others and talk about solar
FTC Disclosure Statement and Disclaimers:
Every video includes some form of paid promotion or sponsorship. Some links on this youtube channel may be affiliate links. We may get paid if you buy something or take an action after clicking one of these. My videos are for educational purposes only. Information is subject to change/update at any time. Electricity is DANGEROUS and can kill. Be smart and use common sense :)
DIY Solar Power with Will Prowse is a participant in the Amazon Services LLC Associates Program,
An affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com
If using this to test a 6v golf cart battery is it best to set the amps to the 20 rating and let it go for 20 hours or is there a short cut verify the amp hour capacity of the battery that's less time consuming?
@Willprowse can you please review the dl24ew version thanks
Hey Will I just want to thank you for all your videos. Because of your videos I’ve learned much about solar abs actually put together my own 12v 2580kwh system. This video actually taught me to check the capacity of my batteries (running as we speak lol) but yeah thanks again
Will, from everything you've said about Battle Born that's where I was headed for 2 of them. But you are giving me the confidence to build my own battery bank & save Serious Money instead!!! THANK'S Will.. TAKE CARE..
You can modify the heatsinked version for nearly 300w. Good to combine with a LVD in certain test cases. Did a video on this a month or so ago. Good stuff :)
low voltage limit - each double click adds 10 value per click,
Thanks for this video, I would never have figured this machine out with the Chinese English directions. This video was soooo helpful!!
Will, you can do 20 amps at over 13 volts with this tester if you make some changes in the setup alarm screen called > 185 W. After you have noted what the TEMP reading is on your data screen while drawing 184 watts for a few minutes with a 12v, LiFePO4, drop in battery, (my unit reads 70 Celsius in my house), you can set the tester in a cooler full of frozen water bottles, or do what I do and set it on the face of a portable desktop fan, or any other trick that cools the heatsink better. You should see the TEMP go down a lot. Now you can increase the > 185 W threshold to 260 W. While you are cooling the heatsink more efficiently with whatever technique you decide to use, you can ramp up the amps until the TEMP gets back to where it was when you started. I can now do a 20 amp draw on a 100 AH battery for a true .2C rate test, as long as I set the tester on the face of the portable desk fan. The TEMP stays below 70 Celsius. You can't set the threshold very much higher without the extra cooling or you will burn up the MOFET under the fan and heatsink assembly. I tried it so others wouldn't have to ( that's me saving face, LOL) Hope this is useful to someone.
2:55
Wow, you really do try hard for us! Thank you
First I really enjoy your videos and the amount of research you carry out before posting.
When I first ran across this device I was ready to buy and held off only because many have posted the "unit fried" or it didn't work out of the box. It would be great if details on why they fail and how to fix them that is if the failure is something simple. I am a middle of the road hobbyist but don't have the tools to replace those tiny SMD components.
I love your videos and I have watched this one several times. I would love to see another dedicated video to finding out a battery’s capacity. I’m still left with a bunch of questions, like……
Do you charge the battery to a certain voltage?
What voltage do you then stop at?
If I have a 3.7 volt battery, what do I charge it with? What voltage do I charge it to?
If I have a 12 volt battery, what do I charge it to? Is there a universal charger?
I would just love to see a super in-depth video crossing all battery voltages, charge voltages, discharge voltages, chargers, and examples. Thanks a lot!
Did you ever find a good video?
I'm having trouble understanding the process
I got one of these last week in the mail. Its pretty cool. have used it to check the life of some of my old portable phone charger banks. tonight I will use it to check the capacity on my new LG Chem li-ion 120AH modules. It would take to long and get way to hot with a regular RC charger. the cooler does a good job. I also will put a small heat sink on the back for heavier loads.
I bet your workshop stays warm. Good video.
I've been using the same tester for months in my review videos and it works great. You can also power it via 5v usb instead of needing to plug it into the wall. Good for testing outdoors.
Oh that's what you use?!?! I remember seeing you use some kind of tester! That's awesome so glad you give it a thumbs up :D if you and I don't kill it, no one can haha
I bet the fet will burn out one day. Would be cool to make it water cooled
@@WillProwse Yep! I only use it to DC discharge solar generators or test panels so the power limit has been a non issue. The fins bend real easy and I can see myself eventually breaking the fan but I keep it in a plastic case now. I wish they had something like this for AC testing inverters!
I got this Tester for the last year or so and do all my Amp tests on this unit when I do 18650 Lithium packs up to 200Amp
I picked up one of those little heat sink/fan combo testers the other day, hooked it up this morning to a 4-cell 280Ah LiFePo4 pack. Sucker works great! Ten hours in and it's not even halfway through the expected capacity.
Cool video as usual! If all goes well this year I plan to upgrade from my 12v AGM system to a Lifepo4 either 24 or 48v one, hopefully over 300ah total. Found a deal on used PV panels. The question is, do I need to check just to voltage to make sure they are working or the Amps as well? In either case would I also need to test them on a Sunny day or would part sun work?
Love your videos! I noticed that the voltage at the battery with NO LOAD verses voltage at the battery WITH LOAD (.2C) are substantially different. Which voltage measurement should determine the top (3.65v) and bottom (2.6v) voltages?
This is awesome, exactly what i needed. Last Time i used my fishing trolling Motor. Had to write down every hour the A to get like 90% what a Pain....
Thank you for the video so far Will, I learned a lot from you. Can you review the DL24 version? It looks like DL24 is an upgraded version of what you reviewed in this video.
Great tutorial! To speed up the test, can I use 2 of these in parallel?
Dude your reviews are so professional! I’m trying to build a bms for Nissan Leaf modules…I have wired them to 15.8 volts so I can use them for car audio amplifiers…any thoughts? These are extremely powerful batteries and I bought a bunch of them
I have the same load tester and, like you, I had a preconceived notion that it would be cheap and inaccurate. Imagine my surprise when I compared the voltage and current values the load tester reported with readings from my high dollar Fluke multimeter. Less than 1% difference! Be careful to always turn both the course and fine current adjust knobs fully CCW before connecting a battery source. Should you forget it will cost you about $5 to replace the mosfet. Thanks for the great video.
Gi’day Will, always a pleasure watching ya mate, luv from downunder…✌️
Probably said by others but the power lost in the leads is not included in power measured. I.e. the capacity measured would be somewhat lower than actual. A "four lead" unit compensates for this as the extra leads measure the battery voltage at the cell and the power consumed then includes the lead losses. Great work Will! you are awesome :-) .
It makes little practical difference at these levels.
Great video, going to buy one of these myself. Could you please tell me what the "two wires connected to an xt 60" are and where I can buy them
Thanks for the video Will. I needed a way to test my battery packs for my ebike's.
Me too :-)
I just wanted to let you know that I purchased one of these capacity testers like I said I would and I have a total of 3 lithium iron phosphate batteries that I wanted to get tested. On the third one the load tester popped and sparked and the big main mosfet in the middle failed!! I'm glad that I ordered this from Amazon and I have started a return!!
Yeah mine just blew up too!! Need to post an update. what a bummer!!
@@WillProwse i have 3 of these from a year ago. Now not one of them will turn on.
Is there a way to "reset" them? None of them "blew up" or smoked or anything like that.
@@WillProwse Do you have an updated video for this issue? I can't find it if it was posted.
Thanks Will but you didn't cover the Test result part. How do you know your capacity? Is it just a readout on the display? And how does the low voltage cutoff factor in to the calculations? Since you are only testing its capacity to a certain low voltage level, how do you determine entire capacity if you ran it down even further?
Is there anyway to do rapid testing to estimate overall battery capacity? Maybe through the use if variables like internal resistance and such?
Hi Will Thanks for all that you do. Great help I have 4- 12V 200Ah batteries. I am having trouble with the batteries shutting down. Is there a way to load test the batteries to fine the bad battery . A multi meter reads 27.9v on all 4
Thank You for the informative vids. Can anyone recommend a programmable/adjustable low voltage disconnect for a 20-30vdc system?
Another great video.
A little off topic...but close... how do you increase voltage into the thousands? And test it? I’m thinking portable electric fencing (got chickens?) as a diy project.
On the topic of capacity testing....have you retested any of your cells after some cycles or time? See if the 10yrs/1000s of cycles life are true. Would be interesting to see after cycles and after "floating" for weeks or months.
One word of advice, those fan testers are known to fail at some point in time and they fail in a dead short. Always add a fuse between the battery and the tester.
Good point
DIY Projects Will does mention having a fuse at 5mins 29 seconds👍
What size fuse would be recommended for a 150w connection? I went up to 160w
w/o a fuse and poof it fried.
@@xraykadiddlehopper8067 depends how many amps you pull. 150W at 3.2v is less than 50 amps and at 12v it's 12.5 amps. Use a fuse slightly larger than what you plan on pulling. So if you want 50 Amps. go with a 60 amp fuse.
not so beginner friendly I guess, slow down Will
okay I got two of those fan battery capacity testers
please have a video on how to use the particular ports and how to test the gt4000s
Thanks for sharing this info on such a neat device. Can you test super capacitors to see if the Farad value claims match what is sold?
I am interested in buying these 16.2 Volt 83.3 Farad super capacitors sold on ebay and Amazon. Are they really what they are.
Hello from Brazil; I like your project to test the cells. You are cutte guy.
HI,
Thanks for the video.
I have no clue on how to use this tool... what settings do i need to use in order to test a 36V 12.8Ah battery? Thanks a lot!
Hi, Will. Do you know a lithium battery charger where we can specify the maximum charge voltage. I've been trying to find one that let's me charge for example to 4.0V instead of 4.2V. I've the Opus charger and Skyrc Imax B6, but the minimum voltage the skyrc let's me use is only 4.14V. Thanks and congrats for this great channel.
according to the amazon listing the reason for turning down the load settings to 0 before connecting the battery is because you can burn out the load transistor and resistors.
can you use a anti spark xt90 connector is it a matter of the inrush that destroys the unit?
Will, very time I have a question about batteries all I have to do is look on UA-cam and there you are with the answer !!! Thanks William Orange county, ca.
yes there are lots of shady crooked dealers on... it seems like most of them have shop and then along... thank you very much this is a very good tutorial.....
Did you test the USB input? Especially USB-C is a nice feature if it works good I think.
Good basic testing info, thanks. One comment: At 0:58 when you characterize 116 Ah as a "ripoff" for grade B cells, I think that's a bit harsh. That's 96.7% of rated capacity; for grade B cells, at that price point, is quite reasonable in my opinion.
Yes true. Should have been nicer. Good point
Hi Will,
How do I add more cells in parallel to the existing pack say after a year. i mean after one year the existing packs will have lower Ah.
Great review !
But, the "low voltage protection" does not disconect the load. It only use a buzzer to warn you. So if you are not here you can kill your single cell without BMS
Oh crap thank you! Didn't know that. Thank you
I'll pin your comment so others can see
wire relay to the buzzer. fixed.
@@ninja5672 Wow--thanks for the heads up!
Supplementary Heads Up ! There are TWO versions of this unit, 150W & 180W so do pay attention to which one you are getting.
IF testing batteries directly, DO put an appropriate sized FUSE between the battery & the load tester. Will makes a comment in the video BUT people are missing it.
Hey I was just wondering if I buy a battle born battery and just want them for emergency use do I need to keep them on a battery tender so they are always ready to go or will it hurt them? Thank you so much
How do you decrease the low voltage disconnect? I’m trying to do so with my 3.2v cell. What voltage would you recommend?
Will, how Would you recommend I do a full capacity test on a used battery that I'm considering purchasing? I can't Arrange a 6 hour test, What I don't wanna get ripped off on a large lithium battery purchase... Help!
Will - do you have a video on lifepo4 battery chargers ? Using a NOCO 5A currently but looks like its broke now ....
Will thank you for all the time you've put into these videos and sharing your knowledge. Many have no idea the time and energy it takes just to publish these. Something I'm always curious about is sort of a lessons learned video, we all know what happens when we short these bad boys...lots of sparks and honestly on the higher capacity cells possibly lethal. I'll never forget trying to do my dad a solid back in the early 80's when I attempted to install his new car battery in his 77' Chevy Nova. I learned that when you leave the large plastic insulator block that came on the bottom of auto batteries in that day to insulate from poor storage (i.e. concrete floors); that if, you leave said block on the battery and install said battery and slam shut the hood it is very possible (100% chance in my case) that the hood of the car will short circuit the battery. My dad was none too pleased to see two large silver dollar sized holes in his hood :) Do you have a video of lessons learned? If not is it something you would consider making? Thank you again!
i have 3 of these from a year ago. Now not one of them will turn on.
Is there a way to "reset" them? None of them "blew up" or smoked or anything like that.
@@RemodelCalculator have you measured DC volts at the round plug end of your power supply? Outside of that, nope, no clue what's wrong with your units.
@@motleypixel i measured voltage at "Output" plug - same as input voltage
@@RemodelCalculator hold on, a wall wart (older term for AC>DC power transformer) shouldn't have the same input/output, typically in the US the input would be 115VAC and the output is typically between 5 and 24VDC. So in your case your wall wart isn't transforming anything and 115VAC has fried your unit :)
Thanks! What is OCPD? Did you add a fuse between the tester and battery or do you mean the battery has it?
Will, I have looked at some of your videos trying to find the equipment you have used in the past where you can set your charge voltage and watt output. What is that tool called?
Can y send energy with that module or only discharge? I find something what measure capacity on discharge and can send that energy somewhere else.
Do have a link for the temp sensor probes you use for the smart bms you suggest for a 48v LiFePo4 diy battery. The ones I have are not working properly and read -17 instead of proper temp. Thanks in advance.
I bought one of these testers and did a lot of testing with individual 3.2v prismatic cells. It worked very well. Today I wanted to test my 48v (52v) battery pack and when I turned the tester on (rotating the coarse knob) it burned out the tester. The FET’s under the heatsink popped. Any idea what I did wrong?...
Well said Will. Nice video !
With thin leads I guess the voltage readout is some 0.5V lower at 20 Amps. Does the test unit have some I*R cable voltage drop compensation or maybe separate test leads?
At high current you may disconnect to early if you do not compensate for the cable voltage drop.
I am curious, do you test a 12V Lifepo4 battery to verify Ah and Wh rating by letting them run down until the BMS shuts down the battery due to low voltage or until running it down to 10% SOC or so?
Can you use one of those to test one of the Bigbattery 3Kvh setups?
It would also double as a handy tent heater for my next inland bike tour.
Single cell with BMS capacity test.
Could you just connect all (4) leads to the positive terminal?
Theoretically it should give the same results for each connection. What do you think?
Can this tester be used on multi-cell lipo packs like those used in radio control cars and planes, or it it only for a single cell? I would need a low voltage alarm for 6 cells at 21 volts.
I have a Qwork Battery Monitor Voltmeter Ammeter that uses a shunt. You mentioned that I could use something like this to do a capacity test. How would I do that exactly? My battery is a 48V 105AH LiFEPO4 battery hooked up to a golf cart. Thanks.
Can this be used to determine battery health (SOH) of a 12v LiFePO4? I utilize 4 in a 48v series for my mower, but recently have had trouble with charging.
How do you chart the voltage drop off? Figure must be some program and usb voltage meter?
Heard you mention 180 some watts for the load tester but the links show at most 150 watts. Can you clarify and link where you go the 180 Watt unit?
I would love to see a more detailed video about the C-Rating. I'm still confused about that. I see 20-C (on the battery), and a 1, 2, 0.1, 0.2, and so on in your on-screen postings and i'm confused. and, how would i use the c-rating when testing or comparing battery / system setup and what-not's. thanks.
I think a Will Prowse clip on that would be cool too. In wondering along the same line, I ran into a pdf Guide to Understanding Battery Specifications: here is what that says: "C- and E- rates - In describing batteries, discharge current is often expressed as a C-rate in order to normalize against battery capacity, ... A C-rate is a measure of the rate at which a battery is discharged relative to its maximum capacity. A 1C rate means that the discharge current will discharge the entire battery in 1 hour. For a battery with a capacity of 100 Amp-hrs, this equates to a discharge current of 100 Amps. A 5C rate for this battery would be 500 Amps, and a C/2 rate would be 50 Amps. Similarly, an E-rate describes the discharge power. A 1E rate is the discharge power to discharge the entire battery in 1 hour.
Hi Bud.Are you sure this tester has a low voltage cut off? Or does it just sound a beeper when the battery reaches .The low voltage set premeter.
Do you have allready a case-file for the 3d-printer?
The device you are using in this video comes with a USB port and the USB cable with positive and negative internals on one end, and USB on the other. Can this be used instead of using the positive and negative terminals on the device?
Can this be used to load test my lithium ion, nicad and NiMH 18 Volt DeWalt batteries? I want to see what shape they're in. Also, do you know of any device that will load test a battery and let me develop a discharge curve so I can compare batteries? thanks. All the best!
Can you put two load testers in parallel to speed up discharge?
Good video, of course! One question to anyone. Is the low voltage setting on this device an actual disconnect or just a warning alarm? Just to be clear does the low voltage setting on this capacity tester turn automatically turn it off when the low voltage is reached on the battery or does it just produce a warning alarm?
Oops, just saw my answer. It just does Not stop the device, Just Warns you.
I been playing with mine. I thought it did shut down when the voltage got below the setpoint but maybe I was distracted by the beeping. The voltage levels are really hard to adjust. They go full scale in one direction 300V or zero and they won't reverse direction. This may go back.
Hi, do you discharge the battery only or do you charge the battery as well?
What if the LifePo4 battery has a BMS with Bluetooth? Would the BMS Bluetooth reading be accurate enough if you hooked the battery to a load in order to find out the Ah's of the battery?
If you want faster testing can you just run two of these at the same time? I don't see an obvious reason why not, but curious if there's anything I'm missing.
When are you going to start your battery certification sticker? "WPBC" (Will Prowse Battery Certified)
hello , for mistake i charged my lifepo4 battery 4,2v for some hours, do you think did i dameged them?
I’m stumped! Need advice. I bought 2 PowerUrUs 12V 200amphr batteries for my Class A diesel pusher. I’ve got a magnum charger/inverter. I set it CUSTOM w 14.4v Absorb, 13.5 Float, 14.4 Equalize (per BattleBorn/Magnum setup video). It bulk charges at ~133 amps, then absorbs around 60amps, then floats at 0amps. PowerUrUs app is quite worthless. Ran capacity test with this tester. Zeroed it, set it at 150W, ~13amps and the test on both batteries was only ~21 amphrs, not 200+ when the BMS shut the test down. Test only took ~2hrs, not 15 hrs. App says low voltage protection, PowerUrUs charger applied. All lights are green and no amps being added when the battery is fully discharged. It’s 61 degrees outside.
I bought this capacity tester to test a cheap "135AH" LIFEPO4 battery off ebay Australia, it came back as 70AH LOL.. I returned it, but the seller has since sold hundreds to unsuspecting people & they are even leaving positive feedback.. I also used it to test a "90AH" AGM I bought off ebay a couple of months back, it tested at 15AH!!!! Also returned.. Definetley worth the investment! I have since found a decent "100AH" LIFEPO4 from LanPlus Australia, it tested at 98AH. Happy enough with that.
hi there, can be put toghether lithium battery different Amps like 3 cels 90A with 1 cell 100A ? and also can be put together different C rates?
i have for exemple 80 cells 18650/1500mAh on 3C can i put them in series with 18650/1500mAh but only on 1c ?
thanx
Could this be used to test an NMC 5ah 4.2v cell that has 30c charge and 70c discharge.
Question! can I safely hookup this monitor to a 36v/55Ah lithium battery? Question no. 2~ can I plug it into a 120v outlet?
Great vid professor will 😁😎❤
I see you use your computer now to do your battery capacity tests. Do you have any links to the software and hardware you use? Thanks!
Please can u tell me how can I run solar panels without batteries but with MPPT and inverter
Could you test Edison Nickel iron battery, love your tests and videos.
Just posted a video on nickel iron batteries here: ua-cam.com/video/60CBlgRTZmY/v-deo.html
Thanks for the idea! Have been wanting to film about those for ages
@@WillProwse Wow, That was the fastest I have ever seen a video response to a question.
This is interesting along this line.
The Edison battery is very durable, but it has a number of drawbacks," said Hongjie Dai, professor of chemistry. "A typical battery can take hours to charge, and the rate of discharge is also very slow."
Now, Dai and his colleagues have dramatically improved the performance of this century-old technology. The Stanford team has created an ultrafast nickel-iron battery that can be fully charged in about 2 minutes and discharged in less than 30 seconds. The results are published in the June 26 issue of the journal Nature Communications.
Graduate student Hailiang Wang, lead author of the study, said the team managed to increase the charging and discharging rate by nearly 1,000 times.
I work with on Electrochemistry of Ni-Fe battery, not viable for solar applications. However, they're great to substation backup especially in hotter countries where Li ion degrade faster & thermal runaway is just around the corner. A great Will, thank you 😊
What voltage would you set the lvd for the diy battery?
Thank you, your video helped me Will
You mention this load can be used on single-cell capacity testing why can't you use it on something like a 13s4p li-ion pack?
Very good information Thanks
So what is the difference between the 150W and 180W versions? The 150W version would take longer to discharge the battery?
If it charge to 3.2v what is the safe discharge volt for lifepo4?
If you use this on a newly charged LGM Sealed Lead Acid, and don't set a minimum test voltage, did you just destroy the battery when you get back? I mean isn't it bad to run that into the lowest voltage (like 0)?
The 85A capacity tester linked to Aliexpress is not available as of 21 Nov 2020.
Will, I keep getting that annoying beeping sound, without the battery even hooked up due to my low voltage shutoff at
Who do you buy from at aliexpress? I had 2 orders with different sellers; and nether delivered.
Thx. Great tut.
So I don't know exactly why; but I just tried to set up the capacity tester for a test and was starting to increase the watt knob up to around 100 W when suddenly the unit started to fizzle and pop and suddenly burst into flames. Scared the heck out of me and also could have burned my house down. Just an FYI on safety of the unit. Luckily the test was only starting when the fault occurred while dialing the watts.