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Some USB battery packs don't allow charging and discharging at the same time. We ordered a selection of the cheaper units and tested them. Here are the results:  | Some USB battery packs don't allow charging and discharging at the same time. We ordered a selection of the cheaper units and tested them. Here are the results:  | ||
* [http://www.ebay.com/itm/321850110492   | * [http://www.ebay.com/itm/321850110492 2600 mAh CoolGo pack] - $6.79 - Works!  | ||
* [http://www.ebay.com/itm/301573240761   | * [http://www.ebay.com/itm/301573240761 2600 mAh No-name "extruded aluminum square" with button] - $6 - Works!  | ||
* [http://www.ebay.com/itm/181725452512   | * [http://www.ebay.com/itm/181725452512 2600 mAh PowerBank "extruded plastic square" without button] - $3.75 - Works!  | ||
* [http://www.ebay.com/itm/252224862952   | * [http://www.ebay.com/itm/252224862952 2000 mAh Motorola flat pack with integrated micro-usb cable] - $6 - No discharge while charging :(  | ||
* [http://www.ebay.com/itm/221974269792   | * [http://www.ebay.com/itm/221974269792 Cylindrical unit without included 18650 battery] - $1.25 - Waiting for it to arrive.  | ||
= Power usage =  | = Power usage =  | ||