Monster Digital ACA-0050 Lithium-Ion (Li-Ion) 400mAh 3.7V rechargeable battery

400 mAh, 3.7 V, Lithium-ion technology Get this rechargable battery to use as a back-up, spare or replacement for the Monster Digital HD camera. Fully charged battery provides approx. 2.5 hours of recording time, depending on settings, environmental conditions and other factors. (Max. capacity will normally decrease with time and use.)