They fit my two watches perfectly and work well. Most importantly, it costs a lot less than if you bought them at retail. If you manage to open the back cover of the watch, changing the batteries is not difficult. Buy a Watch Opener Key/Tool at Revain.com for less than $10. These batteries cost $4+ for 5 packs. Overall, replacing two batteries in the watch cost me less than $10 (including the cost of buying a key). I have no idea how much it will cost at the watch dealer. I suggest you do it yourself.
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