電池內目前電壓 對應的 電量(%)表

Yes you can use multimeter to measure battery voltage to get its state of charge using the follow table. Fully charged battery voltage is ~12.6v. Note you need to wait at least half day(24-hr is more desired) after it finishes charging to have more stable reading from multimeter. Right after you shut off the car, the battery voltage is ~13.5v, which is not real.

Depending on car model and battery, the battery should be able to start your car after it sits idle for at least 2 weeks ~ 6 months.

Battery Approximate Average Cell
Voltage State-of-charge Specific Gravity
12.66 100% 1.265
12.45 75% 1.225
12.24 50% 1.190
12.06 25% 1.155
11.89 0% 1.120

from http://www.type2.com/library/electrip/batfaq.htm

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• great! helpful info! thank you very much, -jck6- ♀ (0 bytes) () 08/15/2010 postreply 10:47:15