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Checking battery - vehicles with battery monitor control unitJ367 or energy management control unitJ644 and data bus diagnostic > < Measuring no-load voltage - vehicles without battery monitor control unitJ367 or energy management control unitJ644

A4 Mk3

Checking battery by measuring current draw - vehicles without battery monitor control unitJ367 or energy management control unitJ644
Checking battery by measuring current draw - vehicles without battery monitor control unit -J367- or energy management control unit -J644-
Checking the current draw capacity of a battery during charging allows you to assess quickly whether a partially or totally discharged battery → Chapter can be made serviceable again by re-charging or whether the battery has to be renewed.
Special tools and workshop equipment required
   
t  Battery charger -VAS 5095A- and trigger clamp, 100A -VAS 5051B/7- or
  W00-10177
t  Battery charger -VAS 5900- or
  W00-10182
t  Battery charger -VAS 5903-
  W00-10436
t  Battery charger -VAS 5904-
  W00-10545
t  Battery charger -VAS 5906-
  Note
t  When charging with battery charger -VAS 5095A-, the current draw of the battery must be measured using e.g. trigger clamp, 100A -VAS 5051B/7-. Battery chargers -VAS 5900-, -VAS 5903-, -VAS 5904- and -VAS 5906- indicate the current draw on the unit.
t  Information on battery chargers → Operating instructions for appropriate battery charger.
Procedure
l  Battery temperature must be at least +10 °C.
l  The battery charger must be capable of supplying a charging current of at least 30 A, as is the case for example with the battery chargers -VAS 5095A-, -VAS 5900-, -VAS 5903-, -VAS 5904- and -VAS 5906-.
l  Battery charger connected and switched on
–  Measure battery charging current after a charging period of 5 minutes.
l  Specification: Charging current must be greater than 10 % of rated capacity.
l  Example: Charging current for a 60 Ah battery after 5 minute charging period: greater than 6 A.
–  If reading matches specification, continue with charging process until battery is fully charged.
–  Then check battery using the battery tester:
t  Using battery tester with printer -VAS 6161- (no waiting time) → Chapter.
t  Using battery tester with printer -VAS 5097A- (after charging, wait for 12 hours) → Chapter.
–  If reading is below specification, renew battery → Electrical system; Rep. gr.27.
  Note
Observe disposal regulations if battery has to be renewed → Anchor.
  W00-10798

Checking battery - vehicles with battery monitor control unitJ367 or energy management control unitJ644 and data bus diagnostic > < Measuring no-load voltage - vehicles without battery monitor control unitJ367 or energy management control unitJ644