Just use Rayovac. Its worth it. The charger costs $79. It charges 1600maH batteries in 1hour. I charge my four sets of batteries in 4hours instead of 4 days. It charges any brand NimH and NiCad batteries. Rayovac batteries can be recharged 1000 times and has no memory problem. The Rayovac charger charges each battery separately. So I can put 4 different brand batteries together. Also I can put batteries with different charges. Once the battery is fully charged, its corresponding LED display will go off. With this charger you can go for a trip and not worry at all about power requirements. I can take shots everyday with my four sets of batteries. I just need an hour per set.
Forget GP. Forget Sony. Get Rayovac! Charges both AA, AAA and 9volt.
if I am not wrong, the Rayonac charger comes with a transformer that looks like it weigh a ton. That was what put me off when I last saw it at carrefour before CNY. Imagine having to lug that thing along during a trip......even bigger than most laptop charger.