Yes, you can replace that AC adapter as long as you get it connected correctly, meaning DC + to + and - to -.Originally Posted by randomwalk101
A twelve volt battery is considered fully charged when it contains 12.8 volts, and it takes a higher voltage to actually get it there. Charging systems in automobiles usually charge batteries at 13.8 ... and 14.5 can do that a little more quickly.
Something has to either stop or slow the charger once the battery is up to voltage, and my guess here is that the 200mA of the original adapter was serving as that limit. So yes, it is probably a bad idea to use a 2A adapter in its place.