UltraFire TR 26650 3.7V 5000mAh Unprotected Li-ion Battery(1-Pack)
Works, but seem to lose charge after a short amount of time. Not as reliable as I would have hoped.
the price is competitive, and also can last long .
Regular Price: $10.24
Special Price: $5.99
Regular Price: $88.00
Special Price: $44.00
Regular Price: $13.70
Special Price: $11.99