Your Global/Davidson battery set has been specially formulated for long cycle life and has unique voltage and specific gravity characteristics. The battery charging set points specified in this guide are for these batteries only, and should not be assumed appropriate for other batteries.It is far easier to discharge a battery than to recharge it. Both the charge and discharge of batteries involve significant inefficiencies. As a rule of thumb for each amp hour of power taken out of a battery 1.5 amp hours must be replaced. In order to complete the chemical process that recharges a battery the electrolyte must reach 104° F. The method used to heat up the electrolyte is the application of charging current (amps) to a discharged battery. If insufficient charge is applied to bring the electrolyte to this temperature the batteries will never fully recharge, and over time, their capacity will be reduced. more... See more text