Sparking the battery will have little effect on the battery.
The charger may or may not have been toasted.
Simply put, connect the charger to the battery correctly and see what happens.
If it charges normally, everything is good.
If it doesn't - have the charger fixed. If you have a doubt about the battery, you can take the battery to a battery store - like Batteries Plus and have it load tested.
Good luck
REW
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