I got more information about the BL21 light and charger

1. Yes, the charger is smart charger, when the light is green, it means the battery is full-charged, and it will stop charging.

2. Batteries are unprotected 18650, the circuit of the bike light has over-discharge protection; This will keep the battery and light safe.

3. The 18650s are 2200mAh

4. The driver of the light is current regulation, The current on High mode is 2Amp.