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It can not work!!!!nice article but the project can not work because a charger works with other principles!a lead battery charging up to 14.4V afterdrive feeds to 13.8 to keep it charged.if you charge the 13.8V battery it never reaches its charge !!!!!!this you have accomplished is a POWER SUPPLY and not a charger!inform yourself well before you disclose erroneous notions, do not always be superficial.http://batteryuniversity.com/learn/article/charging_the_lead_acid_battery