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Hello Kenny,

For the female connector, i ordered twice adapter on aliexpress, for 2$ each.
i'm waiting them, to verify or modify to adapt to the battery

I picked up a couple bases for these that hold the battery beautifully and have 2 wires coming from them for charge/discharge. I also got a friend to 3D print a holder that holds the battery nice but requires the connector and wires(damn limits of 3D printing). I was also planning a wood project to hold the batteries the same as the plastic version. As soon as I get the pins that I ordered I will upload a video to my youtube channel showing all 3 and parts/price breakdown. Hopefully I can do this by May 2021...ish.

Here are some of my projects.


City
 

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Aliexpress 40V battery received !





Test in progress ............
My Aliexpress battery is dead after 3 uses.
Two cells leaked corrosive fluid ( lithium ).
I unsoldered the pcb. it could be use for an other project. All holes except one are compatible with the original ryobi pcb.
 

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I've bought a few of these. I want to package 4 of them together as a pack for my black and decker 36V self propelled lawm mower. So my primary interest is in paralleling the packs and alternative charging methods.

The BMS can be completely bypassed, thus creating the option of both parallelization and alternative charging. The BMS has access points to every terminal for each of the cells in the pack that can be tapped. They are labeled on the board as CL[1-10][+-]. So CL1- is pack ground, while CL10+ is the pack positive terminal. The two half packs are joined with the tab between CL5+ and CL6-. Note that the MOSFETs switch ground to the power tab -, while CL10+ and power tab + are connected directly together.

So it's simple enough to simply solder a wire to CL1- (which is pack ground) and CL10+ and have direct access to the pack without the BMS. A balance harness can be soldered to CL1- and to each CLx+ lead for x from 1 to 10 to have cell level balance access completely bypassing the dormant onboard BMS.

With deals on Ebay for 6 packs for $90 USD which translates to $0.75 USD a cell, it may be worth the gamble to purchase a lot, test the individual cells, and for the ones that pass, strap them together for a already packages, medium capacity, high power pack.

ga2500ev
I have seen lot of video and read lot of suggestion regarding a way of doing something when ryobi battery is a problem, so for me the best way of making a difference is to replace all battery / only tha bad one and make another 2 packs of 10 cells and use tge same board, because of what I read it seams that it is always a battery problem voltage is not the same at everyone. Is it somenthing that you have tried?
thank to let me know
 

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Ryobi 40v rev Q

ok, i got all 13 of my voltages.
G-1 = 4.0
1-2 = 4.0
2-3 = 4.0
3-4 = 4.0
4-5 = 4.0
5-6 = 3.8
6-7 = 4.1
7-8 = 3.6
8-9 = 4.1
9-10= 4.1
G-5 =19.8
5-B =19.9
G-B=39.9

That charger is from when i used to vape. made for 4.2v charging, easy. when I hold the leads on say 5-6 I watch it charge really fast in about 8 seconds(at only 0.5A) then when i let off and reapply voltage starts back at 3.8 and climbs back top 4.2v. Whats going on here?
 

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Hello Kenny,

This morning i monitored the dialog during 1h30.
I discharged a fully charged battery with my electronic load at 5ah for 10 min.
And i plugged in the charger.
For the first 50 min the data was the same
After 50 min until the end of charge, the data move constantly every 20-60 sec.
The refresh rate is not constant.

By observing the scope curve, we can say that the dialog is asynchronous.
I think in this dialog, there are a acknowledge pulse. We can observe two different kinds of groung level.
The small pulse may represent a logic 0 , and the large pulse a logic 1.
Or the opposite.
Anyway, i can count 32 bits.
Only the fisrts 16 bits move.

Kenny, i don't understand why the charger will make this dialog.


1011111000100010 1001100000000100 start
1011111000100010 1001100000000100
.
.
0011111010100000 1001100000000100
0011110110100000 1001100000000100 end
My battery was like this at the end.
0011110110100000 1001100000000110 end
 

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Lots of people keep asking on my video about resetting the older packs with the PIC contacts. If anyone wants to comment on that:

My video DOES show the super simple reset of the newer packs with the RST contacts, so I'd also like to post if there is a way to do it with older boards.

The most common cause in newer batteries is the thermocouple trips on overheats and stupidly (IMHO) doesn't reset after a cooldown. My use case was thick weed cutting with a sold cutting head in Texas heat.

So far, confirmed working resets on OP40501 and OP40401.
 
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