# SoftBank Robotics documentation What's new in NAOqi 2.8?

# Battery

See also

Replacing the battery, Charging the battery

## Usage

NAO can be used while it is plugged in with the adapter. But the battery will charge only if NAO is powered off and plugged to its adapter.

For the related ALMemory keys, see: Battery Sensors.

## Specifications

The following table describes the battery specifications.

Type | Lithium-Ion
--- | ---
Nominal voltage / capacity | 21.6V / 2.9Ah
Max charge voltage | 25.2V
Recommended charge current | 1.8 ~ 2.1A
Max charge / discharge current | 2.1A / 2.0A
Energy | 62.5Wh
Charging duration | 90 min
Power plugged | not available (See: `BatteryPowerPluggedChanged()`)

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