I had my first full day with the extended battery. Overall, I liked it.
- I started with a full 100% charge at 7am. As I type this it is 9:10pm, and I have about 19% left. I used it thoughout the day for web browsing, reading books, and e-mail. I would say it was moderate to heavy usage. Thats a very solid 14 hours on one charge with room to spare. I did not dim my screen at all, and I had 4G turned on the whole time. I did not use any power saving apps like Juice Defender.
- It is pretty bulky. Personally I found it better myself...it is easier to hold for me. Holding a thin slab can be awkward because you have to hold it from the sides. I can now hold it from the back and it feels more natural. I especially like this for reading books.
- It is heavier, and this is noticeable. I think the normal Rezound is 170 grams...with this battery is it 192 grams. Not a massive difference, but you will notice it. Especially since the Rezound is already on the chunky side to begin with. The weight was comparable to my Droid 1 with it's otterbox case. Not trying to sound sexist or anything, but women especially will notice this IMO. For me personally it wasn't a big deal, though I would say it is the biggest downside to the battery (more than the bulk).
- One pleasant surprise is that it does not get hot at all. I was bracing myself for this, but it actually seems to run cooler than my stock battery did.
- One other benefit...my external speaker sounds better! I think it is because part of the interior is hollow now, but the sound was improved (especially "bass", though bass is never great on a speakerphone).
Verizon is still selling these for $30. The sale is not advertised either in store or online, and even in the store they are marked at $50...the "real" price only shows up during the purchase. The box includes the new back cover which is in the same style as the original. Like the original it is rubberized and fits the case snuggly.
Bonus - I now have a spare battery for long trips or whatever.