If the case has just opened because the case was not joined together very well (rather than it being forced apart due to cell swelling) then pop some cyanoacrylate onto the join clip it back together. if the two parts wont rejoin (because the cells have swollen and are restraining the two halves) then discharge the battery to 6.0V and then dispose of properly (tape up the terminals and place it in the correct recycling box provided by your local council).
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