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Other batteries that fit Thunderbolt

It seems to be the same battery as that used by the T-Mobile My Touch 4G. Can't personally attest to that, but Seidio is selling the same 1600 mAh 'extended life slim' battery for both.

http://www.seidioonline.com/product-p/basi16htmec.htm

BTW, Seidio batteries are not high quality. OEM batteries are warrantied for 12 months, but Seidio only 6 months. After about 8 mos, mine were basically worthless.
 
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