SkyTouch 850 mAh Extra Spare Li-ion Replacement Battery for Cricket, MetroPCS Huawei Pillar M615, Pinnacle M635 -Black Lithium-ion technology 850mAh capacity Standard size battery fits under original standard battery cover door Smart IC technology ensures safe operation and long lasting battery life Compatible with: Huawei Pillar M615 / Huawei Pinnacle M635