Sure why not fix it? Here's the scoop on battieries in such things. Match the TECHNOLOGY!! and be as close as you can to the Volts then you're 98% sure it will be ok.
What's the downside?
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I was thinking of getting this battery: http://www.dealextreme.com/p/ultrafire-2400mah-3-7v-protected-18650-cell-1283