The battery should not smoke and if it does you should bring it back. Don't use that, nothing good will come of it. And if it's shorting out like that be careful where/how you store it (if you have one of those metal ammo boxes, put it in there -- without any ammo in it :P )
As mentioned, heavier weight BBs will help your accuracy.
The mechbox is what mechboxes are (and that's why I switched to gas...)...
I can understand how disappointing an experience this is, but don't despair: with the heavier BBs and a good battery you should have a more pleasant experience.
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