I’ve been using both the OEM GoPro and Wasabi batteries in my GoPro 3 with great success. However this triple pack (at under £15) from Duragadget are also doing really well. Reviews from across the net are confirming my findings that they are definitely up to the job and are superb value.
I also have a GoPro battery BacPac in for test, to date this is working really well. I don’t like the additional weight when wearing the unit on my helmet, but when it’s on the boat or tripod it is spot on.