If yoy want to change the battery of watch it will cost 5 quid for single time. but with this kit you can change as much you want.
description is below.
ave you ever struggled to open up a watch and replace a battery? Have you found it almost impossible to remove links in a metal band so you can wear your watch more comfortably? This incredibly useful 16 Piece Watch Repair Kit can help you. Use the specially designed knife to prise open watch backs. Handle batteries with the fine-nosed tweezers. And use one of the professional screwdrivers to remove watch backs or internal screws.