This is the BBT-6S equivalent battery for your Nokia 636 & 638 cell phone

Outline Model Type Capacity Colour Price
Nokia 636 & 638 (BBT-6S) Cell Phone Battery HOR-636 638
(BBT-6S)		 NiMH
(Extended)		 1300mAh
4.8v		 D.Gray $28.48 Cdn
($24 US)