Battery for HTC myTouch 4G or HTC Thunderbolt 4G Powerful 1400 mAh high capacity battery makes all the difference for the HTC myTouch 4G user. This aftermarket battery features powerful Lithium Ion technology, so there is no memory effect either! Lightweight Lithium Ion battery is about 2/3 the weight of a comparable capacity NiMh battery! * Notes: A new Lithium Ion battery's full performance is only achieved after the initial 2-3 complete charge and discharge cycles. Battery may not fit into desktop charging stands & some holsters & cases.