Any battery which is known to be discharged or has a stabilized voltage below 12.2 volts
should be charged as shown below.
12-VOLT MAINTENANCE-FREE BATTERY CHARGING GUIDE
Battery Capacity (Reserve Minutes)
Above 125 to 170 Minutes
Slow Charge
20 Hours @ 5 Amps
10 Hours @ 10 Amps
NOTE: If a battery is to be charged overnight, (16 hours) a timer or voltage
controlled charger is recommended. If the charger does not have such controls, a 3
ampere rate should be used for batteries of 80 minutes or less capacity and 5
amperes for above 80 to 125 minutes reserve capacity batteries. Batteries over 125
minutes should be charged at the specified SLow Charge rate.
BOOST CHARGE
If a battery requires a boost charge, it should be charged at 45 amperes for 20 minutes.
This cannot be used for a new battery being prepared for installation.
MODIFIED CONSTANT POTENTIAL TAPER CHARGING
It is recommended that maintenance-free batteries be recharged on a modified constant
potential taper chargers. The total charge must not exceed the ampere-hour equivalent of
the values shown in the “Charging Guide”. It is recommended that the initial charging rate
not exceed 30 amperes.
177P/N 12261-319 REVISED: August 2012
Courtesy of Crane.Market
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