I think I might try the extra battery and see how I go on. I actually need to move the battery outside the container anyway, so now would be a good time to do that. Hydrogen gas and fireworks don't mix! Who would have thought!
Only batteries of the flooded type release a gas when charged. You could use Gel or Absorbed Glass Mat (AGM) batteries instead. Performance is superior, they keep their voltage better, self-discharge slower and they are completely leak proof. Of course, they are more expensive too.
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