i concur with the other reviews.
i switched to rechargeables about 5 or 6 yrs ago when i first switched to digital cameras and realised that unless i won the lottery i couldnt afford the duracell's ;-)
since then i have used a couple of brands of charger, mainly uniross. i chose these because i needed the 1 hour charge times.
the energizer charger is excellent. it will charge 1, 2, 3 or 4 batteries independently, the others i've used would only do sets of 2 ie; 2 or 4, not 1 or 3.
and whilst i've not bothered timing the difference i'm pretty sure the energizer charges faster then the uni-ross, and at £20 is a tenner cheaper than i paid for that one a few years back.
also, it runs on 12v dc, the plug in adapter converting the mains,
so, if you sort out the right lead you will be able to use the charger from any 12v source ie; your car's cigarette lighter socket.