1. CPU controlling the process of charging and discharging.
2. Ni-CD & Ni-MH & Li-ion battery packs are available.
3. Double colors LED indicating the charging and full charge state.
4. Multiple protection of temperature, short-circuit and over-charging.
5. Charging current: 500/1000mA. Trickle charging current:20mA.
6. External AC/DC adapter.
7. For NNTN4496/4851A/NNTN4497AR/4970 battery.