Power comes in all forms, and it's all around us. Our entertainment streams are full of power struggles, and they continue to play out on the world stage - all day, every day. My own power struggle is much more mundane. I just need to keep my cell phone charged up all day long, and sometimes for more than a day. One way to do that is to carry an external battery pack, like the one in the picture below. Benchmark Reviews has been testing a brand new power pack from industry leader ADATA, on a daily basis for several weeks now. The ADATA PV100 Power Bank is small, slim, and relatively lightweight, courtesy of the advanced Lithium Polymer battery inside. It has a capacity of 4200mAh, which is close to a median value for this type of device.