1. High accuracy operational control system of charging and discharging.
2. LI-ION battery pack is available.
3. Double colors LED indicating the charging and full charge state.
4. The current is 500mA when charging with constant current.
5.The voltage is 4.2V±0.1V when the battery is fully charged
6. External AC/DC adapter.
7. Fit for BLN-5i/7battery.