6
INTERNAL RESISTANCE EXPLANATION
Internal Resistance (IR) is an important factor for accessing a battery’s
capability. When a battery’s
internal resistance exceeds a specific value, the engine can't be started. The normal IR value of
cars should be less than 10mW, but there will be differences between different battery types and
those with greater or lesser CCA.
Normally, for the same kind of batteries, the lower the IR, the healthier the battery is, (short
circuit excepted).
VOLTAGE EXPLANATION
It is impossible for the voltage of the battery to show 100%. The maximum value is normally 98%
even after just being charged.
•
98% Charged = Battery voltage above 12.59V
•
75% Charged = Battery voltage 12.45V
•
50% Charged = Battery voltage 12.15V
•
Discharged condition = Battery voltage less than 12.00V
OPERATING INSTRUCTIONS
If testing batteries of low-frequency use, it is necessary to cycle (charge and discharge) the battery
several times before testing, normally 3-5 times will achieve a reliable test result. Only after
cycling the battery can the chemical properties of the battery be restored. This is particularly
important after long periods of no use. If after 3-5 times of battery charge and discharge, the
battery health state is still lower than 60%, battery replacement should be considered.
1.
To extend battery life, Low use batteries, should be recharged every 2 months.
2.
Please turn off the engine before testing.
3.
When charging is finished, do not test immediately. Wait at least 10 minutes to allow the
battery charge to stabilise, then test. Even when testing an in vehicle battery, after the
engine is turned off (for the most accurate results) wait 10 minutes before testing.
4.
In general, if the battery voltage is below 12.40V, recharge it.
BEFORE TESTING
Before testing, use a wire brush (not included) and alkaline cleaner (not included) to clean the
battery terminals, as any surface resistance on the terminal will negatively affect the test result.
Before testing an in-vehicle battery, ensure the ignition key is turned off. Make sure there is no
power drain from any other vehicle electronics and keep the car doors closed so interior lights do
not illuminate.
