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just because you have a 10A charger dosn't mean your charging at 10A. the amount of current going into the battery is inversely related to it's resting voltage (the higher the resting voltage, the lower the amperage the battery will draw)
So a battery on a 10A charger with a resting voltage of 11.5V may only draw 3A,
-while the same battery on the same charger with a resting voltage of 12.5V may only draw 0.5A,
-while that same battery at 9V would probably pull the full 10A, which on a small battery like the ones we use would create alot of heat and potentally cause a problem or lower it's usefull life.
Most 12V systems have voltage shutoffs that keep you from completely discharging a battery, therefor making them safe to recharge. As long as there is 10-11V on the battery when you hook it up you'll be fine.
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