iFixit has a fairly [guide|127065|comprehensive battery replacement guide for this device], which has a list of tools that you will need to replace the battery. I was also able to find a [link|https://www.amazon.com/Samsung-Galaxy-Watch-Active-Installation/dp/B08MDB7CJF|kit for the replacement battery] that should have all you need, but I would double check to make sure that it is correct for your specific watch.
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One last thing, I was also able to find a [link|https://www.youtube.com/watch?v=6FXR5_cgiHc|video guide for replacing the rear glass], that seems to be using the same kit you got. If you want to try replacing the backglass again, then that should be useful.
Hey there,
iFixit has a fairly [guide|127065|comprehensive battery replacement guide for this device], which has a list of tools that you will need to replace the battery. I was also able to find a [link|https://www.amazon.com/Samsung-Galaxy-Watch-Active-Installation/dp/B08MDB7CJF|kit for the replacement battery] that should have all you need, but I would double check to make sure that it is correct for your specific watch.
Best of luck to you.