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CRYSTAL® BATTERY USER MANUAL
3.1.2 GRGS, HGRGS, GRFT 12-Volt Float Charge Specifications
The above graph represents the correct charge profile for the 12-GRGS, 12-HGRGS, and 12-GRFT batteries and
indicates the minimum required charge curve for float or standby applications with a maximum DOD of 80% to
1.8 volts per cell at an environmental temperature not exceeding 25°C (77˚F).
Bulk/Boost phase charge with a constant current of 0.10C @ C10 (10% of the battery’s 10 hour rated capacity)
for 6 hours with a variable voltage until the battery voltage reaches 13.7 volts. Do not exceed 7 hours charge
time in the bulk/boost phase.
Absorption/Float phase charge with a constant voltage of 13.7 volts and a variable current of 0.1C to 0.01C @
C10 (10% down to 1% of the batteries 10 hour rated capacity).
Green Rhino requires a periodical purification charge to be applied to the batteries when used in a FLOAT
application. See Section 3 for details on purification charging.
See the previous table and the datasheet for float settings for the 12-volt blocks.
