Totally dead lithium batteries
🕑 Added 2024-06-05 16:37:57 +0000 UTCMy fault entirely, for getting these with a tool and then losing them for a few years.
When cells are self-discharging it indicates that there has been an issue with the electrical separator inside them.
The charge circuitry is a bit weird. They've used a control chip designed for a negative charge input, but added circuitry to adapt it to positive charging.
Comments
Jonathan Hughes
Just replace the bad cell.
Mark Eichin
When I first picked up one of the $30 alibaba specials, I couldn't find replacement batteries... because apparently most of the cheap knockoffs just steal the Makita battery design and everyone already seems to know that :-) (ran for casual yardwork use for another couple of years with a knockoff-makita battery, though as of a month ago it no longer starts up.) Kind of funny that we got a little bit of standardization in the battery space, by simple theft :-)