Battery No-Load Voltage - Vehicles Without Energy Management Control Module, Checking

Battery Testing

Maintenance-free batteries must not be opened. Otherwise, the warranty is void.

Battery No-Load Voltage - Vehicles without Energy Management Control Module, Checking

• Measuring the no-load voltage, e.g. within the prescribed maintenance and service work on vehicles in storage, determines if the battery must be recharged => Maintenance Tables.

Special tools, testers and auxiliary items required

• Multimeter (VAG 1526C), Multimeter (Fluke 83) or equivalent (VAG tester illustrated here for reference only).





To ensure correct measurements, follow prerequisites and procedure exactly as given:

Prerequisites

• If no-load voltage on battery installed in vehicle is measured, disconnect ground cable.

• Battery must not be discharged by electrical consumers within 2 hours prior to measurement.

• Battery must not be charged within 12 hours prior to measurement.

• Battery temperature must be at least -10 °C.

Procedure

- Disconnect battery ground cable.

After a holding time of at least 12 hours:

- Use multimeter to measure voltage between battery terminals.

• Specified value: 12.5 Volts or above = Battery OK.

- If no-load voltage is under 12.5 Volts, charge battery => [ Battery, Charging with Midtronics Diagnostic Conductance Charging Station INC-940 ] Battery Charging.

- After charging for 5 minutes, perform load test => [ Battery, Load Testing with Midtronics Diagnostic Conductance Charging Station INC-940 ].

- If battery no-load voltage is below 11.7 Volts, battery is severely discharged.

- If no-load voltage is OK, reconnect battery.

- Follow measures required after reconnecting battery. =>
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