I'd second James' suggestion on the Ansmann chargers [..] Also recommend the Ansmann batteries...
funny - when we needed a charger for AA cells only, we were also considering the Ansmann charger,
but it clearly was beaten by the GP Powerbank. Also GP baterries have proven to be very reliable. So
we stopped using the FRIWO labeled ones coming with Nikon Cameras. I can understand if you also
want to charge C-Cells and other, but all our digital euqipment uses AA cells or baby AA cells, which
reloads 4 batteries within 60 minutes. As far as I remember the Ansmann charger was more expensive
(GP Set is 69 EUR, with 4 bats and 12V car connector) and a lot slower. I know no other charger which
will recharge your batteries within one surface intervall. Can you update me on this?