If continually deprived, the battery will eventually lose the ability to accept a full charge and the performance will decrease due to sulfation. The topping charge is essential for the well-being of the battery and can be compared to a little rest after a good meal. The constant-current charge applies the bulk of the charge and takes up roughly half of the required charge time the topping charge continues at a lower charge current and provides saturation, and the float charge compensates for the loss caused by self-discharge.ĭuring the constant-current charge, the battery charges to about 70 percent in 5–8 hours the remaining 30 percent is filled with the slower topping charge that lasts another 7–10 hours. With the CCCV method, lead acid batteries are charged in three stages, which are constant-current charge, topping charge and float charge. Lead acid is sluggish and cannot be charged as quickly as other battery systems. With higher charge currents and multi-stage charge methods, the charge time can be reduced to 8–10 hours however, without full topping charge. ![]() The charge time is 12–16 hours and up to 36–48 hours for large stationary batteries. ![]() A regulated current raises the terminal voltage until the upper charge voltage limit is reached, at which point the current drops due to saturation. The lead acid battery uses the constant current constant voltage (CCCV) charge method.
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