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CRYSTAL® BATTERY USER MANUAL
2-Volt Cyclic Charger Settings
Crystal® batteries are high-end pure lead battery products that work best with good quality battery chargers that
have the correct Crsytal® battery charge profile pre-loaded or that is custom programmable. See the below table
and the datasheet for charger settings for the 2-volt blocks.
WARNING: Discharging or charging a hot battery will reduce its life and increase the risk of overcharging.
3.1.5 GRLS 2-Volt Cyclic Charge Specifications
The above graph represents the correct charge profile for the 2V GRLS batteries and indicates the minimum
required charge curve for cyclic applications with a maximum DOD of 50% (down to 2 volts per cell) at an
environmental temperature not exceeding 25°C.
Bulk/Boost phase charge with a constant voltage of 0.30C @C10 (30% of the battery’s 10 hour rated capacity)
for 1 to 1.50 hours with a variable current until the battery voltage reaches 2.47 volts per cell. Do not exceed 3
hours charge time in the bulk/boost phase.
Absorption phase charge with a constant current of 0.15C @C10 (15% of the battery’s 10 hour rated capacity)
for 3.5 hours with a variable voltage until the battery voltage reaches 2.466 volts per cell. Do not exceed 5 hours
charge time in the absorption stage.
Float/Top up phase charge with a constant voltage of 2.28 volts and a variable current of 0.05C to 0.01C @C10
(5% down to 1% of the batteries 10 hour rated capacity).
2 VOLT BATTERIES 2-GRLS
CYCLIC /DAILY CYCLING APPLICATIONS
BULK / BOOST
Temperature
* The above voltage set points are averages over indicated temperature ranges. Please refer to the technical datasheet for more specific voltage set points and temperature compensation for specific temperatures.
* The above set points are for voltage regulated multi stage IUoU and adjustable switch mode chargers.
0.3C
Minimum
(30% of C10
hour rated
capacity)
0.15C
(15% of C10
hour rated
capacity)
0.02C
(2% of C10
hour rated
capacity)
0.02C
(2% of C10
hour rated
capacity)
Max.
3 hours
Max.
5 hours
Unlimited
2.45 volts
2.41 volts
2.37 volts
2.45 volts
2.41 volts
2.37 volts
2.27 volts
2.24 volts
2.23 volts
Constant Current Variable Voltage
Constant Current Variable Voltage
Variable Current Constant Voltage
ABSORPTION
FLOAT
25˚C (77˚F)
35˚C (95˚F)
45˚C (113˚F)
Charge Capacity
C
harging
C
urrent
Charging Voltage
