Before my serendipitous encounter, I had my eye on the Motorola 89442N Universal External Cell Phone Battery, a pack about the size of a phone with a bantam micro-USB arm.
The juice pack for HTC One fortifies mophie's offerings for the Android community, joining solutions for the Samsung Galaxy S III and a universal line of external rechargeable battery packs that help keep users powered up wherever they go.
Via the integrated on-board charging componentry and the standard Porsche Universal Charger (AC), the battery can reach full charge within approximately two and a half hours when connected to a 240V power source.