Battery, testing
WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
- Prior to handling or servicing batteries, read, understand and observe the Warning and Safety Measures for lead-acid batteries Smoking, naked flames, fires and sparks: .
- Always wear suitable protective clothing Eye protection and protective clothing: .
- DO NOT battery test batteries which are gassing. Otherwise there is a risk of explosion.
- The following notes and procedures must be followed to ensure correct measurements.
- When disposing of batteries, always pay attention to the appropriate regulations for batteries and sulfuric acid.
NOTE:
- In order to better determine a batterys overall condition, it is recommended to always perform the battery test in conjunction with the electrolyte specific gravity test
- Always follow the battery tester operating instructions.
- It is not necessary to remove battery from vehicle or disconnect battery terminals.
Special tools, testers and auxiliary items required
- Battery Test Kit Midtronics MCR 340V (VAG tester illustrated here for reference only).
CAUTION:
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.
- Check no-load voltage → No-load voltage, checking
- Connect tester cable clamps to battery terminal MCR 340V Instruction Manual Tester leads must be securely fastened and make proper contact with the battery posts.
- Select test mode "IN-VEHICLE" or "OUT-OF-VEHICLE" (refer to MCR 340V Instruction Manual).
- Select battery type (AGR or conventional) (refer to MCR 340V Instruction Manual).
- Set tester to "Warranty Test" (refer to MCR 340V Instruction Manual).
- Perform battery test by setting load current on tester according to battery (DIN) capacity (refer to MCR 340V Instruction Manual).
NOTE:
- Use print function of MCR 340V where test results are required for warranty claims.
Battery test results:
| Battery Tester Display / Printout | Required action |
| Good Battery | None |
| Good - Recharge | Charge battery where necessary → Battery, charging |
| Use inCHARGE | Charge battery → Battery, charging |
| Replace Battery | Replace battery → Battery in engine compartment, removing and installing |
| Bad Cell - Replace | Replace battery → Battery in engine compartment, removing and installing |