Plug in into a computer, or into a USB-enabled mains charger, and the USB Reserve Power’s internal 950 mAh lithium-ion battery, well, charges.
It’s a Type A USB, and the plug is retractable to protect it from damage. An LED display provides a quick idea of the level of charge available from the device.
Griffin claim the USB Reserve Power will work with “almost any 1 amp USB device or charger”. That covers some smartphones, GPS devices, iPods, etc. See the compatibility chart below.
Buy the Griffin USB Reserve Power
The Griffin USB Reserve Power is available online at Amazon. It has a listed price of US$40, but sells for around the US$30 mark – and under – online.