Power-Sonic Sealed Lead Acid Batteries - Technical Manual - Manual (Page 13)

POWER-SONIC Rechargeable Batteries
Performance Data
Battery Life (continued)
Standby Use: The float service life, or life expectancy under continuous charge, depends on the frequency and depth of
discharge, the charge voltage, and the ambient temperature. At a float voltage of 2.25V to 2.30V/cell and an ambient
temperature of 20°C to 25°C (60°F to 77°F) Power-Sonic batteries should last four to five years before the capacity
drops to 60% of its original rating.
The graph in Figure 11 shows life characteristics in float (standby) service for ambient temperatures ranging from
15°C to 55°C (60°F to 130°F). If prevailing ambient temperatures are well above 20°C to 25°C (68°F to 77°F) the
life expectancy of this type of battery in float service depends greatly on temperature compensated charging. The typical
temperature coefficient is 2mV/cell/20°C and under.
Figure 0: Indicates how capacity changes over time.
Figure : Service life at various ambient temperatures
R
etention Capacity (%)
Years
Ser
vice Lif
e (Y
ear
s)
Temperature (°C)