Buy Mugen Power Sprint (CDMA) HTC HERO 200 1800mAh Extended Replacement Battery [HLI-HERO200SL] I ordered the Mugen Power 1800mAh battery for Sprint Hero a couple of weeks ago and it arrived from Hong Kong over the weekend. I'm not that familiar with Mugen Power but supposedly they are reputable and have good quality. The outside of the battery was covered in some sort of thin film/labeling that made it a snug fit, but it otherwise installed okay in the Hero. Got the original cover back on and if its any heavier I can't tell. I left it on the charger for 12 hours initially as instructed, and have fully discharged and recharged it a second time. I will do 2 or 3 more cycles like this to condition the battery. Now for performance, what I can tell so far. It definitely takes longer off a fresh charge to see even a dent in the battery charge indicator, whereas on the stock battery the meter drops below a full green icon pretty quick. I really feel like the 20% extra capacity is really there, as I was trying to come up with ways to suck the juice out of this thing so I could stick it back on the charge last night. Ended up leaving Sprint TV going for an hour and then read some ebooks. Left it sitting all night and it was red-lining but still holding a small charge this morning. On the old battery it would have died some time overnight (if not before due to all the network use for TV). Just to be clear I never had severe battery drain issues with the Hero before, even before the update with the messaging fix. It lasts me a whole day without issue but I have to put it on the charge every night. I think I'll still have to charge it every night, or at least the next morning, but the added capacity just gives me a little extra boost and more peace of mind if I need to make extra use of my phone's capabilities.