The Energizer Duo USB Charger can power up your AA or AAA NiMH batteries by plugging it into a wall socket or the USB port of your desktop or notebook PC.
The device is quite small and very handy; you can easily take it with you, slip it into your pocket or throw it into your laptop bag. The charger plugs directly into a USB port; if thereâ€™s an electric outlet available, you can plug the included adapter into the socket and the USB connector plugs into the adapter.
Charging takes about two hours for a couple of 900 mAh AAA batteries, twice longer for 2000 mAh AA batteries.
It has a green LED indicator which blinks when the batteries are charging; it goes steady when charging is complete. But if you find it fun to watch a status window on your computer to tell you how much time is left before charging is complete, thereâ€™s also a free downloadable software to tell you that.