I have the 18ah and yesterday went dead while using a fish finder. Volt was in the 12s when I started. The problem is my charger is not charging it. Do you know how to reset one of these little batteries. My charger works with my other batteries, so I know it's not the charger.
That looks like quite a stack of batteries! I've been watching these little batteries because I have several small UPS systems on computers and they use small lead-acid batteries that need replaced every 2-3 years. Lead is very annoying... The big problem with a LiFePO4 replacement is the limited current thru the BMS. For example, a 1500va (va is the same as watts if the power factor is 1.0) UPS has 2 12v 9ah batteries in series for 24v D.C. 1500va / 24v is 62.5 amps. I don't actually run them that hard. I'm more in the range of 500-700va. 700va / 24v is just under 30a. There is no LiFePO4 in the same size as a 12v9ah (usually 7ah to 9ah are the same size) that can deliver 30a. I have found some that will do 20a and I'm considering it... (A second problem is charging, but 13.6v to 13.8v typical on a lead-acid UPS system will adequately but very slowly charge LiFePO4 in my experience.)
I use similar little LiFePO4 batteries as DC UPSs for small devices. No AC inverter. I use one for the home alarm system, and one for the internet cable-modem in the garage. Both run off of 12V so a battery is more or less just connected directly to the device. 20Ah lasts 2 days @ 5W, roughly. The only downside is that my solution to keep them charged is roughly $100. A USB-C power block plugged into the mains, a 19VDC USB-C cable, feeding 19VDC into a little Victron 75/15 charge controller. For a UPS application you charge LiFePO4 to 14.2V and float at 13.4V. I haven't noticed any capacity degradation after roughly 3 years (so far), even though the batteries are being held at their float more or less forever. -Matt
@@junkerzn7312 I use a similar setup at home. I put a couple of 40 watt solar panels in the upstairs window years ago and now I finally have a use for them. 2x7.2ah LiFeP04 batteries in parallel and a victron 75/10 charge controller. Modem, router, hubs etc are all 12 volts anyway so I've connected them directly. So network is maintained during a power cut. For non sunny days I've set up a changeover relay that switches an old 19v laptop charger into the charge controller in place of the solar panels. I set the charge current in the victron app to 4 amps maximum so that the laptop PSU doesn't trip. ( It would if it was left at the default 10 amps).
Great video. I live in one of the 189 countries that use metric measurements not imperial. Any chance you could flash the metric equivalents on screen please? Final question, shouldn't a 12ah LFP battery be able to draw 12 amps for sixty minutes?
My apologies. I'm trying to remember to put the conversion on the screen. I believe it is because of the small size that the batteries can't pull 100% of their capacity.
Nice to see a review of the smaller batteries. I have several of rhem they're great for projects or for running an ebike safely. I do find that they all fall slightly short of advertised capacity, but it's not really a problem. Just factor it into the calculations.
hey i got a question why are companies all going to LIFEPo4 batteries instead of lithium ion batteries just wonder if you know why or not but yeah i thought about buying one of these but will see i want a 100amp battery so i can run a coffee maker when the power goes out lol and yeah my power went out 4 times this week and the first time it was out for 2 days so i need these batteries not want i need
I have the 18ah and yesterday went dead while using a fish finder. Volt was in the 12s when I started. The problem is my charger is not charging it. Do you know how to reset one of these little batteries. My charger works with my other batteries, so I know it's not the charger.
That looks like quite a stack of batteries! I've been watching these little batteries because I have several small UPS systems on computers and they use small lead-acid batteries that need replaced every 2-3 years. Lead is very annoying... The big problem with a LiFePO4 replacement is the limited current thru the BMS.
For example, a 1500va (va is the same as watts if the power factor is 1.0) UPS has 2 12v 9ah batteries in series for 24v D.C. 1500va / 24v is 62.5 amps. I don't actually run them that hard. I'm more in the range of 500-700va. 700va / 24v is just under 30a. There is no LiFePO4 in the same size as a 12v9ah (usually 7ah to 9ah are the same size) that can deliver 30a. I have found some that will do 20a and I'm considering it...
(A second problem is charging, but 13.6v to 13.8v typical on a lead-acid UPS system will adequately but very slowly charge LiFePO4 in my experience.)
Thank you for the great information and comment!
I use similar little LiFePO4 batteries as DC UPSs for small devices. No AC inverter. I use one for the home alarm system, and one for the internet cable-modem in the garage. Both run off of 12V so a battery is more or less just connected directly to the device. 20Ah lasts 2 days @ 5W, roughly.
The only downside is that my solution to keep them charged is roughly $100. A USB-C power block plugged into the mains, a 19VDC USB-C cable, feeding 19VDC into a little Victron 75/15 charge controller. For a UPS application you charge LiFePO4 to 14.2V and float at 13.4V.
I haven't noticed any capacity degradation after roughly 3 years (so far), even though the batteries are being held at their float more or less forever.
-Matt
@@junkerzn7312 I use a similar setup at home. I put a couple of 40 watt solar panels in the upstairs window years ago and now I finally have a use for them. 2x7.2ah LiFeP04 batteries in parallel and a victron 75/10 charge controller. Modem, router, hubs etc are all 12 volts anyway so I've connected them directly. So network is maintained during a power cut. For non sunny days I've set up a changeover relay that switches an old 19v laptop charger into the charge controller in place of the solar panels. I set the charge current in the victron app to 4 amps maximum so that the laptop PSU doesn't trip. ( It would if it was left at the default 10 amps).
Thanks for the info and the comment.
Anderson Edward Miller Anna Lewis Margaret
Johnson Melissa Wilson Linda White Sharon
Great video. I live in one of the 189 countries that use metric measurements not imperial. Any chance you could flash the metric equivalents on screen please?
Final question, shouldn't a 12ah LFP battery be able to draw 12 amps for sixty minutes?
My apologies. I'm trying to remember to put the conversion on the screen. I believe it is because of the small size that the batteries can't pull 100% of their capacity.
I have the 18Ah and the 30Ah XZNY battery that I use for a 12v cooler and my ham radio both work great
Thanks for sharing and the comment.
whats the max amps these can put out lol never mind you answered my questions lol
CAN PUT A SMALL 12V FRIDGE IN THIS BATTERY..?
Yes. It would probably give you 2 to 3 hours of runtime
Cool
You should do a run test on something like a Garmin Fish Finder.
Great idea. Thanks for the comment.
are you testing its capacity until the bms cut off or you set a cutoff voltage to stop the test?
The capacity test is until the battery BMS shuts it down.
If you used these in a razor scooter, wouldnt you need to install a lifep04 specific charger?
If the charger is set to charge up to 14.6v and stop, you should be fine.
@@OffGridBasement the stock razor charger is only set for 12 something bolts I believe. So that’s why I was curious
good info thanks
You're welcome. Thanks for the comment.
you should do a video to see how long you can run your A/C with those batteries
They can’t support the current draw
@@bigguyprepper no way?
The surge would overpower the battery. I don't think it would kick on. Thanks for the comment.
Nice to see a review of the smaller batteries. I have several of rhem they're great for projects or for running an ebike safely. I do find that they all fall slightly short of advertised capacity, but it's not really a problem. Just factor it into the calculations.
Thanks for sharing and for the comment!
hey i got a question why are companies all going to LIFEPo4 batteries instead of lithium ion batteries just wonder if you know why or not but yeah i thought about buying one of these but will see i want a 100amp battery so i can run a coffee maker when the power goes out lol and yeah my power went out 4 times this week and the first time it was out for 2 days so i need these batteries not want i need
Safety and recharge repeatability. You can charge and discharge lifepo many more times. Many videos available.
Lithium ion also has a bad rap for catching on fire. Customers feel more confident in the safety and stability of lifepo4.