Battery Ratings; Kilowatt-Hours; Battery Maintenance; Safety Procedures - Yale 524150797 Maintenance Manual

2240 YRM 1890
5. Over Current / Shorts: The pack is designed to
self-protect and shutdown if current exceeds
allowable rate. Batteries can be recovered by
removing short / over current condition /
operation, and waking up the pack again.
The ratings of batteries are measured in ampere-hours
and kilowatt-hours at a constant rate of discharge.
Ampere-hours is the measurement of battery capacity.
The Lithium-Ion battery is rated at 56A/hrs. To
calculate ampere-hours, multiply amperes by hours.
See Table 5. For example, 5 amperes times 5 hours is
25 ampere-hours. You cannot change the potential
difference of a cell. The constant rate of discharging
can be compared to a measurement of the battery
capacity and ampere-hours. For example, a battery
with a rating of 600 ampere-hours during a work period
of 6 hours will generate 100 amperes per hour for 6
hours. The same battery cannot generate 300
amperes for 2 hours. The heat generated within the
battery will damage the battery.
Table 5. Battery Capacity Terms
Amperes × Hours = Ampere-Hours
600 Ampere Hours = 100 Amperes for 6 Hours
Volts × Amperes × Hours/1000 = Kilowatt-Hours
(KWH)

KILOWATT-HOURS

A kilowatt is 1000 watts. A watt is a measure of electric
power. The capacity in kilowatt-hours is the total power

SAFETY PROCEDURES

1. Lift batteries correctly with a crane or equipment
designed for the job. Move batteries with a lift
truck or a conveyor or rollers designed for that
purpose. If the battery does not have a cover, a
rubber mat or insulating material must be put over
the top of the battery to prevent a short circuit
with other equipment. Make sure the lifting
equipment has enough capacity for the job, such
as a chain sling.
2. Never put metal materials or tools on a battery.
NOTE: Only if ALL conditions above have been
performed and verified should the battery be serviced
and/or replaced.

Battery Ratings

generated by the battery. Watt-hours are measured by
multiplying the voltage by ampere-hours. To measure
the kilowatt-hours, divide the watt-hours by 1000.
volts × amperes × hours
To calculate the kilowatt-hours for a battery that has a
rating of 600 ampere-hours and a 48-volt system, use
this formula:
48 volts × 600 amperes × hours
The watt-hours can be converted to kilowatt-hours to
indicate the battery needed for the operation. Always
select the correct type of battery. Remember, a battery
that has a rating of 300 ampere-hours will not do the
same job as a battery that has a rating of 600 ampere-
hours.

Battery Maintenance

3.
4.
5.
= kilowatt-hours or kWh
1000
1000
Disconnect battery from lift truck before doing
maintenance or repairs.
When maintenance on the battery or the battery
charger is required, disconnect both the AC and
DC power. If the battery connectors must be
replaced, make sure the positive and negative
terminals and cables are kept separate and
insulated from each other. Even a momentary
short circuit can cause an explosion and damage
the battery.
When tightening the battery post nut, ensure
proper torque is used. Tighten battery post nut to
8.5 ± 1.5 N•m (6.0 ± 1.0 lbf ft).
Battery Ratings
= 28.8 kWh
15