How do I replace the battery on the huawei fit smart (MES-B19) watch.

I have a huawei fit smart (MES-B19) watch. The watch doesn't hold a charge. But it's on when it's in it's charging cradle. As soon as I either disconnect the cable or lift the watch off of it's cradle the watch goes black. Everything works while it's in it's cradle. I have watch repair tools, but can the watch battery be replaced with another battery from another huawei fit smart MES-B19 watch? This watch is in perfect cosmetic shape taking the fully functional battery from one that's not in good cosmetic shape.

Could someone give me step by step guides on how to do this to make sure I don't mess something up. Also do I have to replace the glue and seal on the watch when putting it back together.