Testing Battery Capacity (Load Test)

Preliminary work:
Checking state of charge, Check Condition of Battery






Quiescent current retention unit
disconnect, connect.

Battery
disconnect, reconnect. Disconnecting and Connecting Ground Cable At Battery

Battery
remove, install.

Electrolyte density
measure, min. 1.24 kg/dm cu; if electrolyte density <1.24 kg/dm cu, charge battery

NOTE: On vehicles with two batteries both batteries must be removed and tested separately.

Load test at 20 °C
perform.
Capacity/Ah Load current/A
74 230
100 300

Battery minimum voltage
check, specification after 10 seconds approx. 10 V or >10 V.

If specified value is not reached, renew battery.
If specified value is reached, charge battery.

Electrolyte density
measure, specification 1.28 kg/dm cu.


Commercially available testers
Acidimeter e.g. Hazet
Volt/ampere tester with load resistor e.g. Hermann, Electronic
Quiescent current retention unit e.g. Hans Zeheter CMP 12.2