Be patient and wait for the next HTC update. If your still on 3.29, wait for 3.30; 3.30 feels like an entirely new phone. I was able to get ~19hrs one Saturday and that was with everything stock. If you're using the phone on a day to day basis, simply wait and get the new update. Conversely, you can get an 1800mAh battery that would fit using the regular back panel.
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