ATC 850mAh NiMh Cordless Telephone Battery For Panasonic HHR-P104, KXTG5423M, KXTG5428F, KXTG5428R, KXTG5431S, KXTG5431W, KXTG5432M 3.6V Capacity: 850mAh,Voltage: 3.6V,Battery Type:NI-MH Designed to meet or exceed performance of original battery. Battery shrink wrap casing made of 100% post consumer recycled product (May vary in color based upon market availability as such, no varying in functionality) Unique design only allows battery connector to be installed one way, preventing short circuiting of the battery and device this product comes with a 1 year manufacturer warranty