@Cameron Roberts, tagging you as you were interested in this...
Originally posted this on TDS in March of 2016 (about a month before this forum was born). Griffin Technology has FINALLY released their portable Apple Watch charger (Apple certified product). It has a 1050 mAH battery & is good for 2 full charges. Comes with micro USB recharging cord & a little "stand" if you want to use it. Price is $69.99 with free shipping. But, google "Griffin Technology coupon code" & find a coupon. I used one & got 20% ($14.00) off, so it was $55.99 delivered. Unfortunately, website now shows it OUT OF STOCK (a lot of people were waiting for product release so 1st run sold out quickly) but now you can keep an eye out for it if you want one. Here's the link:
Travel Power Bank for Apple Watch