At a reported 550 mAh, these USB rechargeable batteries are built more for comfort than speed. You won’t be powering your camera flash unit or any other power hungry device for that matter. The batteries are probably fine for a small flashlight or radio. As you can see from the picture, recharge these by pulling the cap off and inserting into an open USB port. The manufacturer claims they can also be recharged via approved chargers which would seem to negate the main selling point of a USB chargeable battery.

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