Help Needed with Bafang BBS02


New Member
Hi I have a Bafang BBS02 with a P850C controller, with a Liitokata 36 vt 20Mah battery.

Firstly the controller indicates that at 36 vt that the battery is only 50% charged.

When I ride it after about 10 minutes, it starts to shut down power, only powering in small bursts. the battery indicates around 10-15% battery power and goes red. BUT when I convert to volt display it shows I have around 30-32 volts.

I seems like the controller is being tricked into thinking I don't have any power when in fact I do.

what can I do, is it the P850C controller, the motor, or the BMS in the battery.

At what voltage should the power start dropping out

Help im completely lost



Active Member
At 30v your battery is mostly discharged. At full charge it should be at 42v. Maybe it's a charger issue?

"A typical 36V e-bike needs a battery that delivers power between 30V and 42V. A 36V pack at 42V is 100% charged and holds as much energy as it can; at 30V it should shut down and stop giving power before causing permanent damage."