Battery

Model: CR2450
Nominal Voltage: 3.0 Volts
Nominal Capacity: 550mAh (@0.2mA Discharge Current, +23° C)
Standard Discharge Current: 0.2mAh</para>
Maximum recommended current under continuous discharge: 3mA
Maximum recommended current under pulse discharge: 15mA

Attention:

DO NOT recharge, short-circuit, disassemble, deform, heat or place the battery near a direct flame. This battery contains flammable materials such as lithium and organic solvent and performing any of the above actions could cause it to ignite explode or become damaged.

The battery is protected by a schottky diode, this will prevent recharging of the battery if external power is applied to PORTB or PORTD on the AVR Butterfly.