Power but his job can not conjure up also ...

From high-quality Sanyo rechargeable batteries or from fresh alkaline batteries Standard provides this travel charger for more than 500 mA charge current ready - if the then enough, the battery fill about a smartphone in the fast charge mode, also depends on the charging electronics of the remote terminal. Here even seems a converter to be built, of which nearly 6V by 4 * AA Alkaline or 5V by 4 AA NiMH * to the charging electronics of a smartphone agreeable 5.2V (when de-energized, when loading the voltage then breaks at 4, 4-4,6V a how down to a USB port as well) or stepped up. But clearly must each also that the charging current of the battery or batteries decreases over the discharge and possibly considered by the charging electronics of the device as no longer sufficient - which leads to the termination of the charging process - before about the 4 * 2000 mAh nominal capacity typical NiMH batteries could be transferred.
For the price so absolutely fine, the greatest drawback of the tiny switches from LED to off load is about USB device - might prefer to be slightly larger and flatter, so that the not unintentionally operated in your pocket ...