The batteries (1450mAh) will power any device you need them for, then when the time comes take them out, pop off the caps and insert them into a USB port for quick easy charging.
There is even a handy blue LED to show when the batteries are charging which turns off when they are fully charged.
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Please be warned that the item http://www.7gadgets.com/2008/06/14/usb-rechargeable-aa-batteries/5530 you are covering is a fake, in breach of IP of Moixa Energy USBCELLs (covered by coolest gadgets) http://www.usbcell.com/ip (e.g. see US7375494) and in breach of compliance/battery rules in several countries (as may not be marked/insured/set up for recycling and environmental rules).
Please can you remove the item, as it supports counterfit, or product that cannot be exported/sold without a buyer trusting your site and risking becoming becoming a victim of this IP breaching item.
regards
USBCELL Safety and Compliance Team
It does appear to be that this item is not a USB Cell sanctioned battery?