This is best done by a watch repairman. Changing the battery yourself and doing a pressure test may seem like an easy thing to do but it’s actually more complex than it seems. It’s best to leave it to experts. Watch repair shops have done it many times so they are likely not to make a mistake. Costs are at about £17 on average. It can go upwards of £25 depending on which repair shop you choose.
1.5 volt battery with pressure test
Average Price: £17
Top Price: £25