Using the Apple Battery Charger with non-Apple batteries

Question

The Apple Battery Charger's product description page states:

The Apple Battery Charger can recharge one or two batteries at a time. It's optimized for Apple-supplied batteries and it works with AA NiMH batteries from other companies, too.

Does anyone know the required specifications for using non-Apple batteries?

The Apple supplied batteries are AA Ni-MH Min. 1900 mAh 1.2V HR6.

I have some Powerex AA Ni-MH Min. 2500 mAh 1.2V, so I'm wondering if they are compatible. I'm also curious what other non-Apple batteries are compatible.