Exide Technologies Section 95.10 - Manual (Page 12)

Minimum float voltage (temperature corrected) is 2.21 VPC. Temperature correction
does not apply below this value.
Maximum float voltage (temperature corrected) is 2.40 VPC. Temperature correction
does not apply above this value.
Example At 18.3°C (65°F)
V corrected = 2.27 - (18.3-25) (0.0055)
= 2.27 + 0.037
= 2.307 VPC
Modern constant voltage output charging equipment is recommended for the float
charge method of operation for the batteries. This type of charger, properly adjusted to
the recommended float voltages and following recommended surveillance procedures,
will assist in obtaining consistent serviceability and optimum life.
After the battery has been given its initial charge (refer to Section 8), the charger should
be adjusted to provide the recommended float voltages at the BATTERY TERMINALS.
Do not use float voltages higher or lower than those recommended. Reduced capacity
or loss of battery life will result.
9.2 VOLTMETER CALIBRATION
Panel and portable voltmeters used to indicate battery float voltages should be
accurate at the operating voltage value. The same holds true for portable meters used
to measure individual cell/battery voltages. These meters should be checked against a
standard every six months and calibrated when necessary.
9.3 RECHARGE
All batteries should be recharged as soon as possible following a discharge with
constant voltage chargers. Recharge time should not exceed recommendations given in
Section 8.0, Table A. However, to recharge in the shortest period of time, raise
the charger output voltage to the highest value that the connected system will permit.
Do not exceed 2.40 VPC. Maximum recharge current should be limited to 20A / 100 AH
(20 hr rating to 1.75V@25C). The charger used should incorporate a current limit fea-
ture. The maximum recommended charge current for the battery is as shown below:
Model Current (Amps)
Relay Gel R12VU1 6.0
Relay Gel R12V22 10.0
Relay Gel R12V24 14.3
Relay Gel R12V27 17.2
Relay Gel R12V31 20.9
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