Some questions:
• When the Apple Battery Charger has fully charged both batteries, does some sort of light come on immediately, to indicate it's finished?
• Once it's fully charged both batteries, is it ok to leave it plugged in, switched on, with both batteries still in it? Can you leave it in that state for months?
• If the batteries discharge over time (say a month) while they're sitting in the Apple Battery Charger, will the charger re-charge them again automatically? Or do you have to take the batteries out of the Charger and put them back in again for it to work?