Datascope System 98 Service Manual page 172

2.4.5 Battery Life
There are a number of factors that will effect the length of cyclic service of a
battery. The most significant are ambient temperature, discharge rate, depth of
discharge, and the manner in which the battery is recharged. Generally speaking,
the most important factor is depth of discharge.
The relationship between the number of cycles which can be expected, and the
depth of discharge is readily apparent. In relation to a specified discharge rate, if
the application requires a longer cyclic life than is obtainable by selecting the
battery capacity according to the general rule of discharge rate vs. time, it is
common practice to select a battery with larger capacity. Thus, at the specified
discharge rate over the specified time, the depth of discharge will be shallower
and cyclic service life will be longer.
Certain batteries are designed to operate in standby (float) service for
approximately 5 years, based upon a normal service condition in which float
charge voltage is maintained between 2.25 and 2.30 volts per cell in an ambient
・ . O OT
temperature of approximately 20°C (68 F).
In normal float service, where charging voltage is maintained at 2.25 to 2.3 volts
， Bins 8
per cell, the gases generated inside the battery are continually recombined into
the negative plates, and returned to the water content of the electrolyte.
Through the gradual and slow corrosion of the electrodes, the battery will
eventually lose capacity and come to the end of its service life. It should be noted
that the corrosive process will be accelerated by high ambient operating
temperatures and/or high charging voltage.
LENGTH OF SERVICE WILL BE DIRECTLY EFFECTED BY THE NUM-
BER OF DISCHARGE CYCLES, DEPTH OF DISCHARGE,
AMBIENT TEMPERATURE, AND CHARGING VOLTAGE.
2.4.6 Safety Precautions
Batteries can generate explosive gases. Keep sparks, flames, burning cigarettes, or
other ignition sources away at all times.
Do not connect or disconnect live circuits.
Turn off charger before attaching or removing a lead from the battery.
Ventilate the area when charging.
When charging a battery out of the System, never allow battery temperature to
go above 125°F. If the battery feels hot, cut back or stop charging until battery
cools.
Never attempt to charge a frozen battery. Allow the battery to warm to 60°F
before placing on charge.
When removing the battery:
Always disconnect the ground cable first. When installing a battery always
connect the ground cable last.
2-60 System 98 Service Manual
Chapter 2, Theory of Operation