Battery Results; State-Of-Health (Soh) - Midtronics GR8 1100 Instruction Manual

GR8 1100

Battery Results

The GR8 displays one of six battery decisions (GOOD BATTERY,
GOOD-RECHARGE, CHARGE, RETEST, REPLACE BATTERY,
REPLACE BAD-CELL) and an analysis, which includes the
battery State-of-Health (SOH). Refer to the screen illustrations
and table in the next column.
Use the UP (p) or DOWN (q) ARROW keys to scroll to each
screen. To return to the Main Menu, press the EXIT soft key. To
print, press the PRINT soft key.
IMPORTANT: When you start a new test, the last
battery test in memory will be overwritten. Re-
member to record or print the results if you need
to retain them.

State-of-Health (SOH)

Another factor affecting a battery's ability to crank an engine
is its actual condition or State-of-Health. It is a measure of
the battery's condition relative to a fresh battery. Based on
cranking rating, open-circuit voltage, conductance (ability to
deliver current) and battery temperature, the GR8 will not only
qualify a battery as "good" or "bad" (should be replaced), but
can also identify a "marginal" battery.
Although a State-of-Health problem can be the result of
defects in construction, it is most often the result of normal
wear-out mechanisms, which are dependant on vehicle needs,
climate, and operating conditions. This results in irreversible
physical and chemical changes until eventually the battery
can no longer hold a charge and supply the power necessary
to start the car and provide auxiliary power to the electrical
system.
As the battery approaches end of life, its deterioration
accelerates, until it finally fails to start the vehicle. Before
failing, the battery may start the vehicle under normal
conditions but may not be able to operate in more extreme
conditions. Extreme heat or cold could expose a weak battery
and cause it to fail.
Decision
GOOD BATTERY
GOOD–RECHARGE
CHARGE & RETEST
REPLACE BATTERY
BAD CELL–REPLACE
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Return the battery to service.
Fully charge the battery and return it to service.
Fully charge the battery and retest. Failure to fully charge the battery before retesting may cause false
readings. If CHARGE & RETEST appears again after you fully charge the battery, replace the battery.
A REPLACE BATTERY result may also mean a poor connection between the battery cables and the battery.
After disconnecting the battery cables, retest the battery using the out-of-vehicle test before replacing it.
Replace the battery. This decision indicates a bad cell within the battery.
WARNING: Charging a battery with a bad cell is dangerous!
GOOD BATTERY Results: Battery Test
Screen 1 of 3 (P1/3)
Battery
decision
Measured
battery
temperature
Screen 2 of 3 (P2/3)
The line on the graph marks
the Pass/Fail threshold for
the battery. A measurement
to the left of the line indicates
a REPLACE decision.
A measurement to the
right indicates a GOOD
or GOOD-RECHARGE
decision.
Screen 3 of 3 (P3/3)
T h e r e s u l t s i n c l u d e a
Midtronics infomation code for
ALL decisions.
Recommended Action
35
• • Midtronics Inc.
Chapter 7: Battery Test
Rating that
you selected
for the test
Measured
capacity
Measured
voltage
A measurement near the
line on the right suggests
a marginal battery.
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