Great info here I really appreciate all the effort and time everyone has contributed to this thread.
I've rebuilt my 40v Ryobi battery and I am fairly satisfied. I don't have a standard to compare with as I only have used battery packs. I actually replaced cells during my rebuild, harvested from laptop batteries (tested and monitored of course) but my rebuilt lasts about twice as long as my other packs. (As I calculated, hoped for) it has some problems that I'm okay with, like the 4th led I'm not positive is working, and the pack will cut out under high load.
I use them in ryobi products like weed eater and mower.
Do y'all think the bms is cutting the power based on a current limit programmed in the MC? If so I would think I will experience the cut off from a new Ryobi battery of the same rating.
Or do you think my batteries do not supply enough current and the BMS can sense that, and that's what's makes it cut out.
I don't think it's heat related because I just need to start the mower up again (even with out a rest) and it works fine till I got another high spot of grass that puts a load in the pack.
I understand these BMS are poorly designed for us users, and probably designed with marketing and business in mind instead of reliability. I heard older batteries were designed worse, and newer one are more reliable. Have y'all heard this?
I want to ask this question, and I don't mean to disrespect all the amazing work yall have put into reverse engineering this product.
Can I simply buy a 10s BMS circuit (something like
This ) and bypass all of Ryobi proprietary circuits?
It'd be great to use the same charger, but I don't expect it to be easily possible. I don't anticipate the tool having any problem with it. I know I will need to mod, rather alot, to make it fit and sink heat, etc, but it sounds smart to me... Do you guys see the same benefits as me in doing this?
Just asking because if I find a good quality 10s BMS that fits the specs, in my head I can get a much more reliable pack, probably simplified too.
What are yalls thoughts?
Thanks!