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* Supervised / unsupervised charging: You can opt to charge your car battery through a manual charger. However, there is risk of batteries overcharging. To avoid this situation, you can opt for an automatic battery charger. The automatic charger keeps track of temperature and charge conditions of a battery continuously and adjusts charge speeds based on the charge condition. Alternatively, you can select manual batter charger with LED indicators. With this type of charger, you can set the battery charging rate.
* Battery type: Chargers must conform to the type of battery used in your car. Your car may be fitted with wet or sealed lead acid batteries. Sealed batteries are also called SLI/RLA/GEL/AGM or simply maintenance free. The use of wet battery chargers on sealed batteries can damage the battery.
* Voltage: Battery chargers are voltage specific. Thus, while choosing a battery charger it is important to ensure that the charger voltage conforms to the actual voltage requirement of your battery.
* Size: Every battery needs a specific amount of current to get completely charged. The required charging current or battery current is stated in C-Rate, where C stands for the battery capacity expressed in amp hours. For example, a 100Ah battery has a ¡°C-Rate¡± of 100 amps. Thus, to fully recharge a 12V 100Ah battery using a 12V/10A charger will take 10 hours if the battery is fully discharged.
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