Apple Watch Series 2 42mm Stainless Steel - Display popped loose
I'm needing some advice about repairing my model A1758 watch. I bought it used a few months ago, in very good physical condition. It's still in great shape and everything works well, but the display has completely popped loose. I only have a very few authorized repair options in my area, and none of them seem to be able to help—all they can tell me is that the warranty is long expired, and I'll have to send it in to Apple for replacement, at a cost of $249.
I'm handy and typically try to fix everything myself, and I'm looking at some of those options online (replacing the adhesive strip, for example). But, I need a recommendation about the battery, if it should be replaced at this point or not - ? The battery doesn't look hugely swollen to me, but I could be mistaken... I can confirm that the battery life of the device is satisfactory; I usually get about 2 days of use, before needing to charge.
I've included some photos for evaluation. Appreciate the help, any suggestions or recommendations. I bought this primarily to use for running/jogging, and I've hardly been able to do that, yet!
Apple Watch Series 2, watchOS 6