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 MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 875 (GENERAL ELECTRICAL SYSTEM - REPAIR)20 BATTERY61 20... THRESHOLD VALUES FOR BATTERY INSPECTION OF ALL BATTERY (TELEPHONE EXCEPT FOR TELEPHONE BATTERY)
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
61 20... Threshold Values For Battery Inspection Of All Battery (Telephone Except For Telephone Battery)
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION 61 20... Threshold Values For Battery Inspection Of All Battery (Telephone Except For Telephone Battery)
WARNING: This page is about a different car, the 2010 BMW X5, 2009 BMW X5, 2008 BMW X5, and 2007 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Safety instructions for handling vehicle battery . See 61 00... SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY .
Test step 1 - before charging the battery
THRESHOLD VALUES FOR BATTERY INSPECTION - BEFORE CHARGING BATTERY
| 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
THRESHOLD VALUES FOR BATTERY INSPECTION - AFTER CHARGING BATTERY
| 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.