Battery charger is necessary when the battery charge is below 10v ,it need to charge and boost up for better performance .some of the ups also facing an issue with it's low battery , it wont turn on , also some inverter batteries need to boost to recover it original power , so i think this is a simple solution for it , a simple charger can charge all batteries with slow and fast mode ,simply monitor the voltage and current to adjust the charging mode ,if you want to charge fast then you need to provide more ampere that's it so simple , for slow charging maximum 2 ampere is required. fully dead batteries need slow charge with 1ah first and then boost it with 5ah for full charge. if your battery voltage is below 11 volt then increase the charger voltage to 13.5 volt at that time ampere is also increase automatically if ampere is more than 4ah then reduce the voltage to reduce the ampere to 4ah.
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please read the manufacture data for charging current and voltage before charging any battery for your safety and the battery safety .
like this ; 7ah ups battery charging voltage 14.7 charging current 1.8 ampere.
[ This data is always printed on battery ]
