Apple Duo 270C manual Recharging in both the computer and a recharger

Recharging in both the computer and a recharger

You can use a single power adapter to run both the PowerBook Duo and the battery recharger at the same time.

If the PowerBook is on and contains a battery that is not fully charged, the computer charges the internal battery first. The external battery does not begin charging until the internal battery is fully charged. If you are still using the computer at that point, it takes a little over 2 hours for a fully depleted external battery to charge.

If the PowerBook is in sleep or shut down, internal and external batteries charge simultaneously. If both batteries are fully depleted, it takes about 41⁄2 hours to charge both. If the internal battery is fully charged or absent, the external battery takes a little over 2 hours to charge.

Chapter 6: Power Management 93