robocam
10 kW
- Joined
- May 29, 2014
- Messages
- 773
The 1st and 4th capacity lights flash rapidly when the button is pressed. According to an online manual, that means an unrecoverable error but I don’t see anything that matches the error code of just the 2nd and 4th LEDs being lit during the diagnostic.
This happened when I added a discharging plug in parallel with the power connector on my Haibike. I wanted a way to drain the battery down to 38V for storage to protect the battery but it looks like I bricked it. The problem was that I had the discharge load (two light bulbs) connected to the discharge connector when I put the battery back on the bike. This extremely light load must have caused something to happen in the BMS, and now the battery doesn’t work at all. The charger won’t charge it.
I was able to bring it down to 38V by opening up the battery and bypassing the BMS. Worst case, I’ll keep the cells for when the new battery needs new cells or maybe I could sell it for the cells. The diagnostic mode still shows 100% life with 101-200 cycles.
I have another Yamaha battery that I tested and the discharge connector works if I turn on the bike before I connect the load. Now that I see how easy it is to bypass the BMS, I’m going to discharge the battery itself with a plug I’ll add to it later.
Anyway, any idea what I can try to fix the battery? The BMS looks clean, with no burn marks or obvious signs of damage.
This happened when I added a discharging plug in parallel with the power connector on my Haibike. I wanted a way to drain the battery down to 38V for storage to protect the battery but it looks like I bricked it. The problem was that I had the discharge load (two light bulbs) connected to the discharge connector when I put the battery back on the bike. This extremely light load must have caused something to happen in the BMS, and now the battery doesn’t work at all. The charger won’t charge it.
I was able to bring it down to 38V by opening up the battery and bypassing the BMS. Worst case, I’ll keep the cells for when the new battery needs new cells or maybe I could sell it for the cells. The diagnostic mode still shows 100% life with 101-200 cycles.
I have another Yamaha battery that I tested and the discharge connector works if I turn on the bike before I connect the load. Now that I see how easy it is to bypass the BMS, I’m going to discharge the battery itself with a plug I’ll add to it later.
Anyway, any idea what I can try to fix the battery? The BMS looks clean, with no burn marks or obvious signs of damage.