Fixable?

[u/_beef_cake]

I tried charging and realized it wasn’t because the + is concaved in.

[u/bunglesnacks]

It's usable. Fixable is a different story. I wouldn't try unless you use something non-metal.

You can use a magnet or aluminum foil or something to charge it. These things at Convoy are great for this: https://convoylight.com/products/pcb-board-spacer-for-battery-for-series-connection-increase-the-length-to-fill-the-gap