C&D Technologies RS-2044 msEndurII Series - Manual (Page 5)

RS02044/1114/CD 5 www.cdtechno.com
Part 1: Introduction
The msEndur II batteries referenced in this document are stationary, lead-acid batteries. They are
constructed with an absorbent glass mat (AGM) and are characterized as Valve Regulated Lead-Acid
(VRLA). As VRLA, there is no free flowing electrolyte. They are constructed with lead-calcium alloy grids,
dilute sulfuric acid (electrolyte) enclosed in a flame retardant thermoplastic container with a safety vent
and a flame arresting disk to prohibit a spark from entering the head space of the cell. This type of
battery is nearly 100% recyclable. At the end of life, please dispose of properly or consult C&D for
recycling information.
The msEndur II series of batteries are designed to provide reliable service life with minimal maintenance
when used in accordance with this manual. They are a single cell unit producing a nominal two volts per
cell, which are connected in series for the desired system voltage. The cells are housed in steel
modules, coated with acid resistant paint. These modules come in varying widths, depending on the cell
size and can be stacked up to eight modules high while maintaining their seismic ratings. The msEndur II
series are to be installed in a horizontal position with all connections accessible from the front of the
system assembly. These cells are not designed for operation in any other orientation.
The msEndur II is available in two different battery versions. The standard version has the series
nomenclature of ATP for systems that can float between 2.25 to 2.30 volts per cell average. For
systems where the msEndur II cells will be floated in parallel with flooded battery strings, the ATLP
series should be set on float between 2.17 to 2.22 volts per cell average. Check with C&D to determine
which ATP/ATLP model offers comparable float characteristics.
1.1 Cell Characteristics
Under normal float operation, msEndur II batteries can be installed in proximity to electronic equipment and
in computer rooms with occupied space. However, if subjected to excessive overcharge voltage, hydrogen
and oxygen can be vented into the atmosphere. Therefore, lead acid batteries should never be installed
in an airtight enclosure. Sufficient precautions must be taken to prevent excessive overcharge and
containment of potential explosive off gases. All Lead-Acid batteries, including msEndur II, are capable
of generating excessive potentially explosive gases when charged for prolonged periods at voltages
higher than initial or equalizing charge.
The msEndur II cells are equipped with a “flash 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 valve assembly can cause the release of potentially explosive gases and such action will
void the warranty.