For this test you need a car battery tester. If the battery performs well, leave it alone. When your battery is empty and no longer in use, you will see a black color. In short, don't worry abouth the battery eye. One cannot deduce a state of charge of a lead-acid battery by its open circuit voltage, other than to distinguish between completely depleted and somewhat charged. It does not make much difference whether it is a halogen, LED or xenon lamp. Less than 12.0V - battery depleted or badġ2.1.13.0 - battery MAYBE in some state of charge other than completely depleted.Ībove 13.1V - battery in some rare failure mode with voltage above normal, no good behavior expected. If you have left car lights on all night, the battery can quickly run down. The voltage of the battery (with no engine running) is pointless as well. There also a fuse on the receptacle on the ground wire to OBC and sometimes the connections there get bad. in older battery) may be in another state. You can start buy checking the yellow fuse at the back of charger receptacle, also check the gray wire is hooked up to the receptacle, this wire grounds the charger relay to turn on charger. Whatever the indicator shows, it is immersed in one cell, others (esp. The level somewhat depends on the temperature, a hot battery may have somewhat higher level. A fully charged battery turn green only when shaked. The green color may be a matter of mixing the electrolyte. May need topping up with deionized water (but the battery is likely marketed as maintenance-free and hard to open, so no topping up possible). White (red on some brands): electrolyte is low. Green: electrolyte is dense enough (battery charged above some point) and high enough level.īlack (white on some brands): electrolyte is watered down (battery somewhat depleted) and still high enough level. The only reason it exists is that is increases sales of new batteries.
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