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CRYSTAL® BATTERY USER MANUAL
PLEASE OBSERVE THE FOLLOWING:
when charging Crystal® batteries.
• The voltages quoted in ALL the charging
information are the required terminal
voltages. You may need to compensate your
charger settings to overcome voltage drops over
charging cables and other inline devices.
• When charging with a new charger always
observe the battery during the first few charge
cycles to ensure that the charger progresses
through each stage of charge.
• Green Rhino always recommends new batteries
be given at least 3 additional discharge/charge
cycles before putting new batteries into
mission-critical applications.
• Crystal® batteries will typically increase by 5˚C
(41˚F) to 10˚C (50˚F) during charging. If a
battery is hot during charge, it is recommended
to perform a purification charge cycle and then
re-observe the next charge cycle. If the battery
continues to get hot, consult the
troubleshooting guide at the back of this
manual or consult a Green Rhino office.
• Always try and match the batteries from the
sameproduction batch.
• Allow the batteries to cool down to room
temperature after charging and prior to use for
the best life and discharge performance.
3.2 CHARGE CHARACTERISTICS
GREV
Introduction to GREV
The GREV range is our electric vehicle range of
batteries, specifically designed for demanding power
needs like electric motors and vehicles, internal
transport systems, industrial cleaning machines, golf
carts, caravan, 4WD, and many more. The electric
vehicle batteries have the same high outstanding
characteristics as the GRGS range, however, there
are a few differences to be noted.
• The GREV range has a unique plate design to
deliver faster discharge capability whilst retain
the advantages of a deep cycle battery, however,
the cycles of the battery are reduced.
• Has been designed to work specifically with
electric motors;
• Has a much thicker busbar structure better suited
for high-discharge high-cyclic applications and is
capable of high power delivery more easily;
• Is ideal for motive applications.
The electric vehicle range includes 6V, 8V, and 12V
batteries which vary from 27Ah to 265Ah
capacity. The GREV range share many similarities to
the standard GRGS and GRFT range. The battery case,
separator, terminals, safety valves, and top covers are
all the same however the charging requirements are
different.
Calculating the correct charging current for the
electric vehicle range
The electric vehicle range has a different charge
profile when compared to the regular GRGS or GRFT
range. In addition, the capacity is measured on a
3-hour discharge rate instead of the 10-hour
discharge for the regular GRGS and GRFT range.
The GREV range is charged with less power than the
regular range. To calculate the charging current, use
the following formula:
Battery capacity at a 3-hour discharge rate (can be
found in the datasheet) x 0.2C (or 20% of the C3 rate).
For example:
12-GREV-120 delivers 120 Ah @C3 (on a 3h
discharge) x 0.2C = 24A. The best choice here
would be a 25A charger.
