Probably the best hardware shop in Oxford. Excellent knowledge, range of items. Usually cheaper that the sheds.
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Long life alkaline battery.
LR44 / AG13 Button Cell
Also know as
PX76A, A13, GPA76-C10, LR44, RW82, V13GA, G13A, g13-A, A76, A13GA, 76A, AG13, GPA76
Size of battery - 11.6mm x 5.4mm.