Electrical, Main Battery | Apple 520C, 540C specification

Specifications	Electrical - 10

Electrical

One or two nickel-metal-hydride (NiMH) batteries Up to 3.5 hours of usage per battery before recharging

Recharge time: 2 hours in shut down or sleep mode, 4 hours while computer is running

Power Adapter

110–240 VAC line voltage 40 W, 50–60 Hz