Sorry for the terrible audio - I switched cameras and this was literally my first video with the new one! Gotta fix some things! Hopefully this fix works for your batteries -- PLEASE BE SAFE!!! Don't cross your + and your - wires!!
The Ryobi BMS inside the battery is particularly touchy. In a nutshell, the BMS (Battery Management System) thinks there is a problem, so it won't let you charge the battery for safety reasons. Mostly it just creates additional battery sales for Ryobi though. There are a few reasons the BMS goes into "shutdown" mode: 1) Overall battery Voltage is too low. (The threshold is approximately between 12.0 and15.0 Volts.) 2) The BMS detects "unbalanced" cells in the series string. (I don't have any reliable info on the threshold for this. Perhaps 0.25 Volts discrepancy between cells?) 3) Over temperature. (This should AUTOMATICALLY reset itself, but I don't have info on the BMS software programming.) For non-functioning batteries, try these things: 1) Verify that the individual cells are within 0.2 Volts of each other. (e.g.- all cells at 3.30Volts, or all cells at 3.40 Volts, or all cells at 3.50V, etc etc...) This is called balancing the series cells to match each other. If the individual cells are not balanced, you can use a typical 18650 cell charger (4.20 Volts) with a wire and some alligator clips to charge up the low cells to match the higher cells. Do this one cell at a time. 4.20V is considered fully charged. 3.25V is considered empty. You'll want all five cells to be about 3.30V or above, AND very close to each other... perhaps 0.2 Volts difference or less. (The Ryobi battery's BMS is supposed to take care of this "balancing" but it just never does an adequate job. Manually balancing the cells is far superior.) 2) Once you have all cells reasonably matched in Voltage AND the overall voltage is up around 15 Volts, now put the battery on your Ryobi charger. Does it work now? If not go to step 3. 3) Find the reset pin on your circuit board. It is usually labeled RST. With a small wire, jumper the RST pin to battery ground for about 10 seconds. Remove the jumper, then immediately put the battery onto your Ryobi charger. It should work fine now. If not, you'll have to take more extreme measures. See step 4. 4) In very few situations you may have to use a jumper wire to connect the gate from MOSFET #1 to the gate of MOSFET #2. This will force the FET's to both be on and that should allow you to charge and discharge now. Hope this helps!
Do you know any tricks on how to reset the Dyson Vacuum battery packs? I have charged all cells individually but still will not accept a charge, 100% certain the bms on that battery is still on lock mode, thnx
I Dont Understand Exactly What You Did To Make It Start Taking A Charge. After you measure the voltage 3:16, what else did you do after tou took out the plastic & showed Positive & Ground, then you put it back together; so ehat did you do? I don't get it. Peace Out...
I bought mine last year and I barely use it! The other day I was drilling on the walls to put on curtains rods for the wife, and all of the sudden it stopped working. The batteries show full charge on them, any ideas? It is very frustrating!
Hi i got some problems with a ryobi batery 18v First: the indicator charge just turns on one led when this One have 17 volts,and second, the charger show as if this one are loaded but have 17 volts and the drill don't Work with this Voltage Do you know what could be the problem? If you can answer me I would be very grateful, thank you
I got the same issue, the bad battery has 17v. The good one 20v. Doesn't make sense since they are labeled 18. The bad battery flashes red in the charger and the indicator on the battery itself when pressed only the 4th (tallest) blinks.
jumping it is dangerous in a way cuz some cell depleted and won’t hold charge when you jump entire set you might be over charging one set some bms just bad got to measure each bank and slowly charge them up to match the others
Use the lowest current 12 Volt that you can find. You want to slowly brings these cells back to life, not shock the hell out of them. P.S. - you can use a laptop AC/DC wall adapter if you don't have a 12 Volt charger available. The voltage isn't as important as you might think. Anything up to 20 Volts will ensure the pack doesn't overcharge. (EACH cell inside is 4.20 Volts when fully charged. So..... 4.20 Volts * 5 cells = 21.0 Volts.) What this video fails to acknowledge is that the cell balance between each of the five cells is important. And that may even be the reason the Ryobi charger stopped charging the battery in the first place! Unbalanced battery example: cell #1 = 4.15V, cell #2 = 4.15V, cell #3 = 4.15V, cell #4 = 3.35V, cell #5 = 4.15V. See how cell #4 is much lower than all the rest? The Ryobi BMS doesn't like that and may prevent you from charging the battery. When you charge the battery per the steps in this video, you're doing what's know as "Bulk Charging". You're charging all five cells together as one battery. It usually works ok... unless the cells have become unbalanced! If the cells are unbalanced... then it's much better to "Balance Charge" each cell with the exact voltage it needs. You can achieve this balance charging with a typical 18650 cell charger, connected to the low voltage cell(s) inside the pack with alligator clips and a jumper wire. Go through each cell one at a time... measure first, then charge it to the same voltage as the other cells. Typically you pick the highest voltage cell and make the other four cells match it using the 18650 cell charger to increase the voltage. Once you get the five cells balanced again, it is unlikely that this problem will creep up again. (Unless you have some bad cells.)
@@test-193 I’m attempting to fix two of my batteries, both of which are showing almost the exact same voltages on each of their 5 cells as your example. 4 are sitting fully charged, 1 is at 3 volts. Can I use a basic dc bench supply attached to the problematic cells to bring them up to 4v? Or do I need a specific 18650 charger
@@test-193 Hi, do you know what to do if all the batteries are equal, 3.6ish, and test inside on contacts shows full. However, test outside on the 'tower' contacts only shows 5.6Volts. Thanks in advance
This didn’t work for my battery because one of the cells had leaked and corroded the contacts inside the device causing much damage. Better luck next time I guess!
![RYOBI 18V Battery Not Working? [Easy DIY Charging Hack]](http://i.ytimg.com/vi/sqeiOkSNRsU/mqdefault.jpg)
![RYOBI 18V Battery Not Working? [Easy DIY Charging Hack]](/img/tr.png)
Sorry for the terrible audio - I switched cameras and this was literally my first video with the new one! Gotta fix some things! Hopefully this fix works for your batteries -- PLEASE BE SAFE!!! Don't cross your + and your - wires!!
The Ryobi BMS inside the battery is particularly touchy. In a nutshell, the BMS (Battery Management System) thinks there is a problem, so it won't let you charge the battery for safety reasons. Mostly it just creates additional battery sales for Ryobi though.
There are a few reasons the BMS goes into "shutdown" mode:
1) Overall battery Voltage is too low. (The threshold is approximately between 12.0 and15.0 Volts.)
2) The BMS detects "unbalanced" cells in the series string. (I don't have any reliable info on the threshold for this. Perhaps 0.25 Volts discrepancy between cells?)
3) Over temperature. (This should AUTOMATICALLY reset itself, but I don't have info on the BMS software programming.)
For non-functioning batteries, try these things:
1) Verify that the individual cells are within 0.2 Volts of each other. (e.g.- all cells at 3.30Volts, or all cells at 3.40 Volts, or all cells at 3.50V, etc etc...) This is called balancing the series cells to match each other. If the individual cells are not balanced, you can use a typical 18650 cell charger (4.20 Volts) with a wire and some alligator clips to charge up the low cells to match the higher cells. Do this one cell at a time. 4.20V is considered fully charged. 3.25V is considered empty. You'll want all five cells to be about 3.30V or above, AND very close to each other... perhaps 0.2 Volts difference or less.
(The Ryobi battery's BMS is supposed to take care of this "balancing" but it just never does an adequate job. Manually balancing the cells is far superior.)
2) Once you have all cells reasonably matched in Voltage AND the overall voltage is up around 15 Volts, now put the battery on your Ryobi charger. Does it work now? If not go to step 3.
3) Find the reset pin on your circuit board. It is usually labeled RST. With a small wire, jumper the RST pin to battery ground for about 10 seconds. Remove the jumper, then immediately put the battery onto your Ryobi charger. It should work fine now. If not, you'll have to take more extreme measures. See step 4.
4) In very few situations you may have to use a jumper wire to connect the gate from MOSFET #1 to the gate of MOSFET #2. This will force the FET's to both be on and that should allow you to charge and discharge now.
Hope this helps!
Do you know any tricks on how to reset the Dyson Vacuum battery packs? I have charged all cells individually but still will not accept a charge, 100% certain the bms on that battery is still on lock mode, thnx
My batteries are measuring at 0 volts do you think I can still get them going
I'm wishing I would have bought harbor freight tools but i have too many Ryobi tool to change horse's now . Thank for the video .
Ok What were you doing with the strip wires were you recharging it or tapping with some other voltage
I Dont Understand Exactly What You Did To Make It Start Taking A Charge. After you measure the voltage 3:16, what else did you do after tou took out the plastic & showed Positive & Ground, then you put it back together; so ehat did you do? I don't get it.
Peace Out...
My question is, do u have to take it apart to just give it a jump?
Thanks. Will take top off to get to the + and _ poles. Caution: wear safety glasses just in case.
Gonna try this let you know
Greetings friend. Please tell me. The third LED on the accumulator blinks.What's the breakdown?
I bought mine last year and I barely use it! The other day I was drilling on the walls to put on curtains rods for the wife, and all of the sudden it stopped working. The batteries show full charge on them, any ideas? It is very frustrating!
size of torx bit?
Hi i got some problems with a ryobi batery 18v
First: the indicator charge just turns on one led when this One have 17 volts,and second, the charger show as if this one are loaded but have 17 volts and the drill don't Work with this Voltage
Do you know what could be the problem?
If you can answer me I would be very grateful, thank you
I got the same issue, the bad battery has 17v. The good one 20v. Doesn't make sense since they are labeled 18. The bad battery flashes red in the charger and the indicator on the battery itself when pressed only the 4th (tallest) blinks.
One of the side of battery doesn't come off
Thanks
Did this and my battery didn’t work lol. All my others did. This is my newer battery that it didn’t work for.
jumping it is dangerous in a way cuz some cell depleted and won’t hold charge
when you jump entire set
you might be over charging one set
some bms just bad
got to measure each bank and slowly charge them up to match the others
How many amps was the 12v charger you used?
Use the lowest current 12 Volt that you can find. You want to slowly brings these cells back to life, not shock the hell out of them.
P.S. - you can use a laptop AC/DC wall adapter if you don't have a 12 Volt charger available. The voltage isn't as important as you might think. Anything up to 20 Volts will ensure the pack doesn't overcharge. (EACH cell inside is 4.20 Volts when fully charged. So..... 4.20 Volts * 5 cells = 21.0 Volts.)
What this video fails to acknowledge is that the cell balance between each of the five cells is important. And that may even be the reason the Ryobi charger stopped charging the battery in the first place!
Unbalanced battery example:
cell #1 = 4.15V,
cell #2 = 4.15V,
cell #3 = 4.15V,
cell #4 = 3.35V,
cell #5 = 4.15V.
See how cell #4 is much lower than all the rest? The Ryobi BMS doesn't like that and may prevent you from charging the battery.
When you charge the battery per the steps in this video, you're doing what's know as "Bulk Charging". You're charging all five cells together as one battery. It usually works ok... unless the cells have become unbalanced! If the cells are unbalanced... then it's much better to "Balance Charge" each cell with the exact voltage it needs.
You can achieve this balance charging with a typical 18650 cell charger, connected to the low voltage cell(s) inside the pack with alligator clips and a jumper wire. Go through each cell one at a time... measure first, then charge it to the same voltage as the other cells. Typically you pick the highest voltage cell and make the other four cells match it using the 18650 cell charger to increase the voltage.
Once you get the five cells balanced again, it is unlikely that this problem will creep up again. (Unless you have some bad cells.)
@@test-193 I’m attempting to fix two of my batteries, both of which are showing almost the exact same voltages on each of their 5 cells as your example. 4 are sitting fully charged, 1 is at 3 volts.
Can I use a basic dc bench supply attached to the problematic cells to bring them up to 4v? Or do I need a specific 18650 charger
@@test-193 Hi, do you know what to do if all the batteries are equal, 3.6ish, and test inside on contacts shows full. However, test outside on the 'tower' contacts only shows 5.6Volts. Thanks in advance
This didn’t work for my battery because one of the cells had leaked and corroded the contacts inside the device causing much damage. Better luck next time I guess!
not clear enough...looking for another well made video..
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Expensive junk