You can fit any battery that will physically fit in the case. Provided it is one cell only (3.7 volt nominal). But there's the possibility that the charging circuit is hardwired for the capacity (mAh) of the original and putting in a larger battery could confuse it.
Probably the charger doesn't have that much intelligence so the only effect would be longer charge time.
If you change the battery just be careful about avoiding shorts. Lithium batteries sometimes respond to abuse by blowing up.
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