I have used battery chargers before, but have not always been totally happy with them, either because they were badly made or because it wasn't always clear when batteries were charged and ready, so I was always concerned with over charging.
No such problems with this Duracell battery charger. I bought 8 AA (2400mAh) for use in a camera and they were charged in under 5 hours when used for the first time. The charger feels well made and the door opens and closes reassuringly well, not fragile like other chargers I have owned. The power unit was small but worked well. The lights all lit up red when the charge was started and one by one they turned green once the batteries reached the fully charged point. There was no noticeable excessive heat, just some warmth from the batteries, and I noticed that the small neat instruction sheet mentioned an abnormal heat warning light - I hope I don't need that option, but it is helpful to have.
In summary I am very pleased with this battery charger and would recommend it. I plan to use it for the whole range of batteries it takes, from AAA to 9 volt. Now off to order some more AA and AAA batteries!