I realize this topic came up in April, but I'll toss in my experience with ebay batteries since buying my hero in May....no problem, saved alot of money. The key is to not buy just one extra battery, I bought 2 and 1 extra life battery (the entire 3 co$t less than one extra life anywhere else). I rotate the batteries for even usage, I use my device hard so the extra life will get me through most of the day and I toss in one of the others to complete. The next day I use that battery and the others in order (yes I numbered them). I do not work in a environment where I have access to a ac plug so this works for me. I also purchased 2 wall chagers for the batteries, the extra life has to be charged in phone itself. This may seem crazy to those who can plug their phone in while working, for me it is great, I can use all the features with out watching my battery supply.