The pbq cyclic batteries differ from standard batteries in several ways: the lead plates are made of another alloy and the grids are shaped differently than those found in standard VRLA batteries.
Functional life of cyclic batteries is normally calculated as the number of discharges versus the depth of the discharge (DoD – Depth Of Discharge).
Battery construction of cyclic batteries
Due to the addition of other metals, the lead plates are harder while the different grid shape ensures an excellent conductivity and improved adhesion between the plates and the paste.
What is the functional life of a cyclic battery?
pbq cyclic VRLA batteries offers an exceptionally good functional life with well over 1.200 cycles at 30% DoD. However, the deeper the discharge, the fewer the total number of cycles obtainable from the battery. It is therefore best to select the battery such that a depth of discharge between 30% and 50% will be reached during normal use or use the largest battery that fits your budget and physical space.
Charging cyclic batteries
Although it is possible to charge a cyclic battery with 13,8V at 25oC it is advised to use a 2- or 3-step charger that starts its charge cycle at 14,5 – 14,9V at 25oC. This slightly higher voltage helps in a better conversion of PbO2 (LeadOxide) to pure Pb (Lead) and will ensure a low internal resistance of the battery. 2 and 3 step chargers will drop the voltage when the battery reaches around 60% of its capacity and overcharging will thus be prevented.