Although a battery has multiple cells, none of them is identical because each cell possesses a distinct charge capacity. If the battery is getting deeply discharged, the smallest capacity cell might reach at zero charge. Further, such a cell can then facilitate reverse charge, as the rest of cells keep on forcing current via the former cell. As a result, loss of capacity tends to occur. In short, do not allow a deep cycle battery to discharge to below 20% of its full capacity. Kindly note that the latest batteries might sustain through deeper cycles. Therefore, check out and then act! Typically, electric golf trolley batteries feature a deep-cycle mechanism and need constant voltage. However, they are usually charged with a current lower than what standard batteries demand. Unlike a cranking battery, a deep cycle one is designed to discharge by up to 20% of its full capacity over a course of cycles.
