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Question:

battery charger question?

If I put two 12 volt chargers on a single 12 volt battery will this harm the battery or just charge it up faster? Thanks.

Answer:

Some chargers have a gang mode, so you can wire them in parallel for more current. Otherwise, you may max out one charger and not load the other, or with modern automatic chargers, confuse them. It probably won't harm the battery, and it would charge quicker, I just suspect the chargers would keep switching off because they'd see the battery as fully-charged when it was just the other charger keeping the voltage high. Given the fairly low price of new automatic high-current chargers, just buy a new one. Probably cheaper than a new battery.
In series, they would likely self-destruct, along with the battery. In parallel, they could increase charging current. That could offer faster charging, or it could easily result in overcharging because you're confusing the regulator circuits.

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