More battery fun

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What do you do if battery has leaked badly and PCB won't work? I've checked all connections/traces (and resoldered them) that were damaged by acid on A501, but Amiga 500 still doesn't see additional 512kB of RAM.

 :-(

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I went to my brother to replace battery in his A500+, and to my surprise, it hadn't leaked AT ALL! He is the first and only owner, for sure. And it wasn't VARTA battery, but GP, that must be the cause.
 
Its similar in shape, but doesn't say if its NiCD or NiMh.

Still, we installed Lithium one, just to be sure. Its a bit too close to metal shielding, but works fine.

If only I could find some hot glue to secure it..
Can you recommend me any type of hot glue and "gun" for it?