Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2010128I 2D COUPE, N52, AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSGENERAL ELECTRICAL SYSTEM - REPAIR (E82)BATTERY61 20... THRESHOLD VALUES FOR BATTERY INSPECTION OF ALL BATTERY (TELEPHONE EXCEPT FOR TELEPHONE BATTERY)
2010 BMW 128i 2D Coupe, N52, Automatic
61 20... Threshold Values For Battery Inspection Of All Battery (Telephone Except For Telephone Battery)
2010 BMW 128i 2D Coupe, N52, AutomaticSECTION 61 20... Threshold Values For Battery Inspection Of All Battery (Telephone Except For Telephone Battery)
safety instructions for handling vehicle battery.
Test step 1 - before charging the battery
TESTER RESULT REFERENCE TABLE
| Charge state (1) | Starting capability (2) | Test result | ||||||
|---|---|---|---|---|---|---|---|---|
| Not testable | - | Charge | ||||||
| less than 50 % (2) | - | Charge | ||||||
| more than 50% | less than 75% | Charge | ||||||
| more than 50% | more than 75% (3) | Charge | ||||||
| more than 80% | more than 75% | O.K. | ||||||
|
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Test step 2 - after charging the battery
TESTER RESULT REFERENCE TABLE
| Charge condition (1) | Starting capability (2) | Test result | ||||
|---|---|---|---|---|---|---|
| Not testable | - | Defective | ||||
| less than 50% | less than 75% | Charge | ||||
| more than 50% | more than 75% | Charge | ||||
|
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NOTE:
If battery was checked on the positive terminal in the engine compartment, repeat check directly on battery for sake of safety.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.