I was not aware of that. Do you have links that I could read up on ? They are typically highly praised.eee291 wrote: ↑May 12, 2018 6:57 pmI don't have any experience with ping, but I sure read a lot about them.
They seem to have badly matched cells, so after the pack gets older a cell group just shuts down much earlier.
And replacing the weak cell isn't a solution IMO because you just added a fresh cell to a bunch of old ones.
I would go with the other seller.
But I personally like using cells from the Chevy volt and Nissan Leaf to build my own packs. Because all of those cells are top notch, and matched perfectly.
I've had low voltage protection happen often, though I try my best to avoid it. Sometimes it can't be helped. You don't account for wind, or you when further than you thought, or there was some diff variables.pwd wrote: ↑May 12, 2018 8:48 pmI added a Golden Motor kit to a friend's bike about 6+ years ago and they are using the Golden Motor 48V10AH LiFePO4 battery. The first few years were not easy on the pack since it was often drained until it cut out (low voltage protection on BMS). Last year I had to remove the key switch for them since they lost the key. I was impressed with the quality of the battery overall when I removed it from the case. I asked how the battery life was doing compared to when it was new and it still had lots of life left in it. If I was to hazard a guess I'd say it still has about 80+ % capacity left compared to new. I would recommend a GM battery if it suits you needs.
My pack was acting quite strange today after the charge. The BMS lights where blinking back and forth for almost a hour, and the voltage from the discharge plus was not matching the voltage, from the charging plug. It wasn't until both voltages matched, that I was able to use the battery. I did have some duct tape touching the flat battery cells on the side, and when I removed that. Suddenly voltage jumped up to match the charging port. It could very well be just a coincidence.
Posting reply here: viewtopic.php?f=14&t=94234&p=1379835#p1379835999zip999 wrote: ↑May 13, 2018 1:26 pmif your battery is cutting out early it because a group of cells is you need to balance the pack hitting lvc before the others. you could leave it on the charger for a day or more and let the bms balance the pack over a very long time on the charger. yes after the light turns green. Or you can measure all 16 cells and write down on paper. if a couple high cells you can drain with a car brake blub. or if a low cell you can charge just one cell. Many threads on how to balance a Ping battery here on E.S.