Do Optima Batteries Ever Produce Gas?

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Do OPTIMA Batteries ever Produce Gas is a good Question

When used with a properly regulated constant voltage charging system (such as an alternator), the OPTIMA battery will normally not produce hydrogen gas. Occasional gassing can occur when charging at higher voltage levels or in extreme high temperature conditions. In automotive applications this typically will not happen if the alternator/regulator stays below 15 volts.