C&D Technologies RS-2044 msEndurII Series - Manual (Page 20)

RS02044/1114/CD 20 www.cdtechno.com
Part 7 – Initial Charging
General Information and Precautions
To safely charge the msEndur II batteries and avoid damaging the battery and/or connected equipment,
observe the following:
• Use a constant voltage charger with only direct current (DC). AC ripple current from charger shall
not exceed five (5%) percent of the 8-hour (ampere-hour) rating of the battery in amps.
• Be sure charger is turned off before making electrical connections between the battery and
system.
• Connect via the appropriate size cable. Verify proper polarity with a volt meter before making final
charger connections and turning on the charger.
• Be certain that all connections are tight and secured before turning on the charger.
The recommended method of providing an initial/freshening charge (section 5.2 and section 7.1 & 7.2) is
to first determine the maximum allowable voltage that may be applied by the connected 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 to a recommended value found in Table 1 and continue charging at
this voltage.
NOTE
Charging current to the battery should be limited to 25 amperes per 100-Ampere Hour
battery rating at the 8-hour rate. Higher charging current can cause overheating that
subsequently increases the internal resistance of the battery, which requires
additional current to compensate for the increased internal resistance. This cycle is
referred to as “thermal runaway”, which has the potential to destroy the battery and
cause damage to equipment.