I have not taken mine apart to see what it looks like, but saw these on e-bay http://www.ebay.com/sch/i.html?_nkw=3.7v+1000mah when looking for batts for my nephew's helicopter, so a hobby store could have them, don't know if these are what you are looking for or if they will fit, but they are cheep enough a guy could experiment with them. dfly
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