4. OPERATION
Batteries are rated in ampere-hours (Ahr) and are selected to perform a specific workload within an
established period of time. Increasing the workload or time period could result in over discharging,
thus shortening battery life. Limit discharging of the battery (to 80% or less) so that specific gravities
do not go below 1.180. If truck operation results in only partial discharges (40% or less) and specific
gravities are 1.250 or more at the end of the shift, recharging may be deferred and the battery used for
another shift, providing the workload is not expected to increase. Hydrometer readings and experience
will determine the frequency of charge intervals under these circumstances.
A battery should always be recharged immediately following a complete discharge. Never allow it to
remain in a discharged condition; otherwise, permanent damage may result. A battery is designed to
be operated as follows:
8 hours discharge
8 hours charge
8 hours cool-down
Tubular-LMX™ Low Maintenance batteries are designed and built to deliver 80% of their rated capacity
at 77 °F (25 °C) each cycle.
5. TEMPERATURE
In the operation of motive power lead acid batteries, the electrolyte temperature must not exceed 110
°F (43 °C). If the battery is continuously operated at or above this temperature, the service life of the
battery will be severely diminished. Under normal operating conditions, battery electrolyte temperature
should be maintained between 60-100 °F (15-38 °C). Following charging, the battery should be
allowed to cool-down or rest approximately 8 hours prior to another discharge cycle.
If a battery is ever hot to the touch, allow it to cool to room temperature before charging or discharging.
If a battery consistently operates at high temperatures greater than 100 °F (38 °C), contact your local
GNB representative for service.
6. CHARGING
When recharging a fully discharged battery, the starting charge rate will be 3 times higher than the
finish charge rate. The charge rate should taper down to the finish rate by the time the battery is 85%
charged and may be even lower when fully charged. High “on charge” temperatures or frequent need
for water additions are indications of overcharging. Short running times and/or low end-of-charge
specific gravities may indicate inadequate recharge. Consult your local GNB representative on specific
charging problems.
The ampere-hour rating of the charger applied to the battery should be within 10% of the ampere-hour
rating of the battery.
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