I have tried this charger with three (3) different gel and deep cycle marine batteries. All three batteries were already fully charged and it was a short test of the device. The charger stayed on "full charge" for at least 30-45 minutes. The device never went into "service" mode and the charge voltage stayed at 17.0 volts. Here you have a microprocessor "automaton". He found his way to the garbage can very quickly.
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