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In some applications, there is a need to recharge conventional batteries (lead-acid or NiCd) quickly. Until now, achieving this task under varying depths of discharge and load conditions has not been possible without excessive risk of overcharging. More deeply discharged batteries, for example, require longer duration boost charging. This paper describes a battery charger control system that dynamically adjusts, for each recharge cycle, the transition point between float and boost modes to achieve minimum practical recharge time, while also achieving desirable low risk of overcharge. By employing more data inputs than traditional boost mode control systems, the resulting charge decision more closely approximates the optimal decision that might be made if the conventional battery were to provide direct feedback on its condition.