Long before it officially existed, there were rumors that the Apple Watch haddisappointing battery life. It wasn't long afterward that we started to hear companies were preparing to build external power packs to compensate. Thankfully, the folks over at Reserve Strap have discovered that you don't have to sacrifice style in favor of usefulness, thanks to the six-pin "diagnostic" port found on the bottom of the watch case. It turns out that the feature doesn't just transmit data, but can receive power at far faster rates than the magnetic inductive charging panel on the underside.