jamsheermckr, Below you will find links to how to change the battery and a couple links to where you can purchase a replacement battery. You can also do a search yourself to get better pricing perhaps. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

LG G Watch R Battery Replacement Replacement

http://www.ebay.co.uk/itm/Genuine-LG-G-W...

http://www.spareslg.com/gb/lg-w110-bater...