How To Fix A Overcharged Battery. And to their defense replacing your cars battery is easy-peasy lemon squeeze-y. While this is of course not a great situation to be in it is still something relatively easy and affordable to fix.

The only way to overcharge a battery is to place to high a back voltage on it. How to Repair an Overcharged Battery. However xtar chargers have a really good reputation and its unlikely that yours wouldve overcharged the battery.
An overcharged battery will boil the sulfuric acid and distilled water mix.
While this is of course not a great situation to be in it is still something relatively easy and affordable to fix. Cleaning the car battery and using electrolytes to replenish it can potentially bring a dead battery back. This can happen if the regulator is defective. Rev the engine and it should hold in this range.

