(10 hour rate discharge
characteristics)
Terminal Voltage (v)
2C
1C
0.6C
0.4C
0.2C
0.1C
28
Think about what types of vehicles a sealed VRLA battery
goes into: most aren’t like the family car, driven day-in,
day-out. They’re probably used once in a while, or
maybe even stored for weeks or months at a time.
That demands a special kind of battery – one with
extra power to reliably start that engine, every time. In
YUASA’s sealed VRLA batteries, the plate groups are spe-
cially designed to deliver that. The graph to the right
shows the increase in discharge time of a sealed VRLA
battery compared to a conventional Yumicron battery
at both cold and room temperatures. The graph below
shows the cold temperature performance of the sealed
VRLA battery as the load increases. “C” equals the
Amp Hour Capacity Rating of the battery.
Discharge Characteristics
Starting the engine is a big part of the battery’s job, but
not all. Electrical accessories and safety systems – lights
and horn – need a stable supply of electricity. Now
you’re concerned with the battery’s “low rate discharge
characteristics.” This steady, low rate discharge is
measured in “10-hour rate discharge.” The graph
above shows the discharge characteristics of YUASA’s
YT or YI sealed VRLA batteries at different current rates.
Note that battery capacity is a function of the current
being used (or discharge current) x time.
13
12
10
8
6
01234567891011
Discharge Duration (hour)
Discharge Characteristics of a
Sealed VRLA Battery by Capacity
(C = 10 hour rate capacity)
5
SECTION
Sealed VRLA
Batteries
Terminal Voltage (v)
Sealed VRLA
Conventional
01 23 4
Discharge Duration (minute)
12
10
8
6
High Rate Discharge Characteristics of a
Sealed VRLA 4 AH Battery
20A Discharge Characteristics
77°F (25°C)
14°F (-10°C)
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