Table 1-5: Specific Gravity And Battery Voltage - Upright TM12 Service Manual

Section 1 - General Information
B
A T T E R Y
Electric UpRight Aerial Work Platforms use deep cycle batteries. If poor service life is experienced, batter-
ies should be checked for bad cells. Fully charge batteries for 14 hours minimum, ensuring that the
charger has completed its cycle (see 'Battery Charging" on page 1-14).
Deep cycle batteries do not have their full potential until they have been through 50 charge/discharge
cycles. Normal 5-day weeks, charging batteries every day, equals 50 cycles in ten weeks.
If bad cells are found in any battery in a battery pack more than two years old, all batteries in the pack
should be replaced for balance.
B
ATTERY
The specific gravity of the electrolyte in the battery cells should be equalized monthly. To do this, charge
batteries as outlined in 'Battery Charging" on page 1-14. After this initial charge, recheck the electrolyte
level in all cells and add distilled water as necessary. Then, turn on the charger for an additional eight
hours.
S
PECIFIC
Check the specific gravity of all cells with a hydrometer. The temperature corrected specific gravity of a
fully charged battery should be 1.260. If any corrected readings are below 1.230, the batteries containing
such cells should be replaced.
Do not check the specific gravity in a cell to which water has just been added. If there is not enough elec-
trolyte in a fully charged cell to obtain a sample for the hydrometer, add water and complete a discharge/
charge cycle before checking.

Table 1-5: Specific Gravity and Battery Voltage

SPECIFIC GRAVITY
Fully Charged
Fully Discharged
L T
OAD ESTING
1. Fully charge the battery pack.
2. With the battery pack at rest and under full load, perform steps 3 and 4.
a. To put the battery pack under full load,
• Activate the steering switch to turn the wheels fully in either direction.
• Continue to hold the steering switch while performing steps 3 and 4.
3. Measure the potential across each battery.
4. Measure the potential across the entire battery pack.
5. Compare the measured results
Any battery that measures 10% lower voltage than the others has a bad cell and should be replaced.
Service Manual
C
H E C K
C E
ELL QUALIZATION
G
RAVITY
Each Cell Per Cell
1.270 2.10
1.130 1.75
B P
ATTERY ACKS
VOLTS DC
6V Battery 12V Battery 24V Battery Pack
6.30 12.60
5.25 10.50
Battery Maintenance
48V Battery Pack
25.20 50.40
21 42
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