I completely agree about the replacement battery! I picked up a MicroQ on eBay (which I've read in other forums are a pretty good clone version, if not perfect) and he added one of these batteries as well. I wasn't sure how well it would work, so I hadn't installed it until I read this thread... so I popped open my ZZ, pulled out the battery clip to bend it in a bit more, and put the new battery in. Charged it up, set it down and started running.
and running...
and running...
I actually managed to get slightly bored with running it in circles BEFORE the battery ran out! I'm going to have to get a few more, one for the MicroQ and another for spare or another Micro sometime in the future. Very much worth the time and effort though!
Oh, I also modded my controller with the small screw clamps from an old printer cable so that my thumbs don't hurt anymore... really love the stuff in this forum!
Cheers.