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The float charger has a separate transformer and rectifier of a lower rating as compared to the boost charger.Analog Devices is in the process of updating our website.

There is no possibility of overcharging of battery in float charging mode.

Thus, the float charger trickle charges the battery to maintain battery voltage.

The float charger releases the current when the battery voltage falls and ceases the current when battery potential gets equal to the charger voltage.

The charging current depends on the difference between the charger output voltage and the battery terminal voltage. If battery voltage lowers then the float charger again starts charging the battery.

When the voltage of the float charger and battery become equal, the charging current becomes equal to zero.

The float charger takes care of the self-discharging of the battery due to its internal resistance.

The float charger slowly charges the battery to maintain its voltage.

The float voltage is much less than the boost voltage.

Thus, the float charger maintains the battery voltage. The float charger charges the battery at a similar charging rate to the battery discharge rate. The charger supplies the minimum current to the battery to maintain its terminal voltage.

The float charging maintains the battery voltage.The battery is put on the float charging mode only after attaining the correct float voltage.Once the battery is in the state of fully charged, the battery charging can be switched over to float charging.During boost charging the exhaust fans of the battery, the room must be in operation because heat, as well as gas generation, is more when the battery quickly charges on boost.There are chances of overcharging the battery in the boost charging mode.If the battery remains on the boost charging for a longer period of time then the battery overcharges and is apt to fail. When the battery gets fully charged, the charger voltage needs to be lowered to the correct float voltage.Therefore, there is a need to adjust the boost voltage after dropping of battery charging current. However, the increased charging current causes a voltage drop in the battery’s internal resistance. Boost voltage increases the battery charging current.The boost charger charges the battery after the battery gets exhausted on delivering power to the load when the AC mains fails.The battery charges at a faster rate on the application of boost voltage. When the battery discharges, its terminal voltage falls. This option of charging is suitable when the battery needs charging just after battery discharge. The boost charger charges the batteries faster.The boost charger has a separate transformer and rectifier unit of a higher current rating.Therefore, the battery draws more current in boost charging.

In the boost battery charging process, the charging voltage is above the normal float setting voltage.Now we will discuss the features of the boost charger and float charger in detail. However, the new battery chargers, function on SMPS technology, and has a single unit charger that functions as a boost cum float charging. Generally, the battery charger unit has a separate boost charger and a float charger of different ratings. On the other hand, the float charger slowly charges the battery to maintain the battery terminal voltage. The boost charger quickly charges the battery. In this article, we will discuss the difference between a float charger and a boost charger.