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Battery chargers serve the critical purpose of maintaining battery charge levels and supplying DC power. The charger output power characteristics can greatly affect the life of a battery. Given the common usage of batteries in industrial application, battery chargers and power supplies have become a necessity in nearly all installations. Different battery charger technologies have both advantages and disadvantages. The technologies described in this paper all serve the same basic purpose. It is the requirements of the end user, in terms of performance, cost, longevity and size, that determine what technology best fits the application.