C&D Technologies RS-1826 Liberty Series 1000 FA Battery - Manual (Page 15)

Higher than normal storage temperature (77°F [25°C] nominal) will acceler-
ate internal self-discharge of a battery by a factor of two for each 15°F (9°C)
over nominal 77°F (25°C) storage temperature. This, in turn, will reduce the
allowable time before initial and subsequent charging.
Therefore it is very important that boost charges be given at the
appropriate time to avoid major remedial action or damage to
product.
All batteries, including Liberty Series 1000 Front Access, are capable of
generating potentially explosive gases when charged at higher than normal
voltages typical of initial or equalizing charge. The Liberty Series 1000 Front
Access cells are equipped with a “flame arrestor and pressure relief valve”
assembly that seals the cells during normal charge and operation but allows
it to safely vent in case of overcharge. Removing the cover and/or valve
assembly can cause the release of potentially explosive gases and such
action will void the warranty.
2.1.3 Constant voltage charging
The recommended method of providing an initial/equalize charge is to first
determine the maximum allowable voltage that may be applied to the con-
nected equipment. Divide this by the number of cells in the battery to obtain
maximum average voltage per cell allowed by the equipment. Adjust this
number down to a recommended initial value found in Table 3 and continue
charging at this voltage for the time specified. Next put the battery at the
recommended float voltage for a minimum of 72 hours before any load is
placed on the system. The battery is now considered fully charged and is
ready for either initial acceptance testing or regular service.
Use only direct current for charging. AC ripple current from charger shall
not exceed 5 percent of the 8-hour (Ampere-hour) rating of the battery.
Charges should be current limited to 25 ampere per 100AH of the 8-hour
rating of the battery.
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CAUTION
Never expose a cell or battery to sparks or an open flame.
When working on a battery, discharge static electricity on the
body, tools, etc., by touching a grounded surface in the
vicinity of the battery rack.
CAUTION
Excess charge current can increase the battery temperature.
The increase in battery temperature will have an effect on
battery life.