C&D Technologies RS-990 Liberty Series 1000 - Manual (Page 18)

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PART 2
CHARGING AND OPERATION OF BATTERY
SECTION 1 - CHARGING
1.1 General Information and Precautions
To safely charge the Liberty Series 1000 batteries and avoid
damaging the battery and/or connected equipment, observe the
following:
• Use only direct current for charging. AC ripple current from charger
must not exceed 5 percent of the 8-hour (Ampere-hour) rating of the
battery.
• Be sure charger is turned off before making electrical connections
between the battery and system.
• Connect battery positive terminal to charger positive terminal and
battery negative terminal to charger negative terminal. Grounding
battery may be either to positive or negative terminal of the battery.
This will depend upon the system design.
• Be certain that all connections are tight and secured before turning
on the charger.
• Perform a voltage test to assure proper connection (Section 4.4).
CAUTION
If the proper polarities are not observed when charging the
battery, the battery or groups of reverse-connected cells will be
irreparably damaged.
1.2 Initial charge
All cells/units are shipped fully charged but will lose some charge in
transit or storage before installation. Provide an initial charge by the
date stamped on the shipping container when stored in a clean, dry
and cool (between 32°F-77°F [0°C-25°C]) location.
CAUTION
Valve-regulated batteries must receive a boost charge (see Part
1, Section 2) if installation will not occur by the date on the
carton or if open circuit voltage drops to 2.10 Volts per cell.
Multiply the open circuit voltage by the number of cells in a unit
to obtain unit voltage. Use initial/equalize charge voltages as
shown in Table 2 of Part 1 or Table 3 of Part 2 for boosting cells
at the Initial/Equalize Voltage.