Yeah, the 1600mAh. I didn't think it would make this big of difference. Still going... LOL. At 9 percent. Gonna let it die so Battery Left will have full calibration. One other note on the Battery Left front, it states at full charge this batteries life is 31 plus hours (obviously usage dependent). Pretty nice.
does that fit in the normal casing?
Yes, the Seidio 1600 mAh slim extended battery fits in the TB with the same rear cover, it is roughly the same size as the stock 1400mAh battery, and it goes for about $45 on Amazon and $50 on the Seidio website (but you can use a coupon code to get a discount). There were rumors that it would not make much of a difference as compared to the stock battery (because aftermarket batteries are known to actually have lower capacities than what they claim, and they typically do not last as many months/cycles as OEM batteries in general). I refuse to get the 2750 because it makes the phone way too huge, and I have to carry it in my pocket and I use a Seidio Innocase. I have no idea how people are getting by with the big HTC battery.
That is very interesting that Battery Left is saying 31 hours total with a full charge on your 1600. Right now it says 23 hours maximum full battery life for me for the stock 1400. I know our different usages probably factor into the estimation, but I still was not expecting the difference between the two batteries to be more than a few hours. I wanted to find out myself, but you have to pay for that app if you want to calibrate 2 different batteries (I have the same Seidio as you, but have not needed to use it yet). I may end up doing it at some point if I start to use it regularly though. If the 1600 is really giving you that much more than the stock, I see no point to the 2750. Just charge every night like normal and you will be fine, and won't have that ugly hump!