You can actually save a bit of money by replacing your own watch battery. It costs almost 10 times to get a watch shop to do it for you. But do note that it is not always cheaper to buy the battery online (which I did). You may get good deals from shops such as Japan Home in Singapore.

Here's how we did it at home with this tool kit that we got from Qoo10. Hope you guys like this video and feel free to share this with your friends!

Tool Kit