6
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.
Battery Voltage Explanation
•
Fully 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
Cold Temperature Effects
Because of the battery’s chemical nature, it will test lower when cold than when warm.
For most accurate results, this effect should be compensated for when the battery’s
internal temperature is below 5
℃
. Assume internal battery temperature to be the
day’s high-low average.
20 30 40 50 60 70 80 90 100%
(¡ ãF) -20 -10 0 +10 +20 +30 +40 +50 +60 +70
(¡ ãC) -29 -28 -18 -12 -6.7 -1.1 +4.4 +10 +15.6 +21.1
Internal Battery Temperature
Test At This Percentage Of Rated Capacity
