Does such a thing exist? I have a small battery mower I use for a small area - Sunjoe 28V mower.
It has ceased to charge. I have spent way more time than it’s worth trouble shooting this $100 mower. It has an internal Li battery pack that has 14 cells. The pack looks clean and intact. The cells all read exactly 3V. So I suspect they are good and the charging system has quit working. I can’t even figure out the charging system. It has what appears to be a way undersized wall wart charger that is 6V DC and plugs into the mower. The power adapter input is fed to what I expected to be some sort of regulator board. But the board has no electronics. The 6V is fed into a bundle of 3 wires. Two are high amperage that feed back to another bundle that goes to the motor regulator.
I saw the diminutive power adapter and the lack of any regulation outside of the battery pack and I guessed that it was simply a ‘trickle’ charger. A horrible way to charge Li batteries but I never cease to be amazed at pitiful engineering in throw away consumer products these days.
Then I noticed that the adapter was 6V. So I guess there must be some sort of internal boost converter to charge this pack? Or perhaps there is an internal smart charger that charges and equalizes individual cells? Maybe I’m not giving the company enough credit for their technology. That is, it looks like 6V DC is fed to the 28V battery pack. But I did not disassemble the pack to see how it’s configured. Just opened the case to count the cells.
Well, not sure why it’s not charging but I thought perhaps there is a generic Li charging gadget for folks like us that can charge any pack. I realize that simply charging all cells in series is not the best way to do it. Some cells become under or overcharged as cell differences develop. But I’m trying to salvage this thing if I can.
What do you think?