Technical data

Chapter 4: Installation

4.8 Battery Care and Backup Battery Calculations

4.8.1 Caring for Sealed Lead Acid Batteries

Sealed lead acid batteries are designed to operate in standby service for approximately five years. This is based

upon a normal service condition where there is an ambient temperature of 20 degrees C (68 degrees F) and

batteries are completely discharged once every three months. Length of service life is directly affected by the

number of discharge cycles, depth of discharge, and ambient temperature.

Use Guidelines

• Avoid installation and/or operation in close proximity to heat sources. While the operating temperature

range is 0 to 49 degrees C (32-120 degrees F), battery life is maximized at an ambient temperature of 20

degrees C (68 degrees F).

• Batteries may generate ignitable gases. Because of this, install batteries in a well-ventilated location,

away from spark producing equipment.

• DO NOT install batteries in an atmosphere where organic solvents or adhesives may be present. DO

NOT clean the batteries with oils, thinners, or similar substances. The case and cover of the batteries are

ABS plastic resin, which may suffer damage from these chemicals.

• DO NOT install batteries in a heavy vibration or shock location.

• ALWAYS wear insulated gloves when handling batteries.

• DO NOT use together batteries of different capacities, age, or manufacture.

WARNING: DO NOT crush, incinerate, or dismantle batteries. The

electrolyte contains sulfuric acid, which can cause serious damage to eyes and skin.

If contact does occur, flush with water and seek immediate medical attention.

4.8.2 Storing Batteries

• For batteries that are to be stored for an extended period of time, give a supplemental charge monthly.

• NEVER store batteries in a discharged condition.

• The self-discharge rate of batteries is approximately 3% per month when the storage temperature is

maintained at 20 degrees C (68 degrees F). The self-discharge rate varies depending upon temperature.

Cooler temperatures cause the self-discharge rate to decrease. Warmer temperatures cause the self-

discharge rate to increase.

4.8.3 Calculating Backup Battery Requirements

A Worksheet for assisting in calculating battery backup is available in Chapter 11.

SP40S Multi-Function Facility Communication System Manual, Revision D