Patent ID: 7589491

Claim:
A method or charging flooded deep cycle lead acid batteries comprising the steps of: effectively measuring the temperature of such a battery having an initial charge deficiency, applying to the battery a first amount of charging energy adequate, in combination with the initial charge condition of the battery, to cause the battery to attain a detectable charge state which is less than a full charge condition and which has a temperature-variable determinable relation to a full charge condition, providing information describing the variation with temperature of a) the relation of the first amount of charging energy to the initial charge deficiency of the battery, and b) the relation of total charging energy deliverable to the battery to attain full charge and effective conditioning of the battery to the initial charge deficiency of the battery, and applying to the battery a further second increment of charging energy which is adequate, in combination with the initial charge condition and the first amount of charging energy, to overcharge the battery to a particular extent which can vary with battery temperature and the quantity of which is determined as a selected percentage of the first amount of charging energy when the detectable state is attained and with respect to a battery having the measured temperature.