At what voltage is a 12v battery discharged?
Voltage on a fully charged battery will read 2.12 to 2.15 volts per cell, or 12.7 volts for a 12 volt battery. At 50% the reading will be 2.03 VPC (Volts Per Cell), and at 0% will be 1.75 VPC or less. Specific gravity will be about 1.265 for a fully charged cell, and 1.13 or less for a totally discharged cell.
Can a battery read 12v and still be bad?
Yes it can be bad if it’s output is 12 volts with no load and the engine not running… Load it down and watch the voltage drop… The starter is a good load to use for measuring the output under load.. Even a new battery voltage will drop with the starter running, but the battery should easily crank the car….
Can a failing 12 volt battery be restored?
To restore the cells, you need to restore the chemical balance. Older batteries need to be checked and topped off with water. New batteries are different. They’re maintenance free, and you cannot mess with their components.
What should voltage drop be on 12 volt battery?
12-volt system: 0.500 volts maximum voltage loss 24-volt system: 1.000 volts maximum voltage loss 2) Replace cables or repair circuits with excessive voltage loss. If the voltage drop exceeds specification, check for corrosion, frayed strands of wire, loose connections or a battery cable gauge that is too small.
How do you check battery voltage on Delco Remy?
1) Ensure the battery is charged to 12.4 volts minimum. Connect the carbon pile tester positive lead to the B+ stud on the starter solenoid. Connect negative lead to the ground stud on the starter. 2) Connect the voltmeter (set on low scale) to the positive battery cable. Voltmeter (+) test lead to battery (+) post.
What does a 12 volt battery reading mean?
But when it reads 12.4 volts, the battery has attained a 75% charge level, and it could still be charged further, there would be no danger. A reading of 12.10 volts means that it is halfway With 11.90 your battery is low and in desperate need of a boost. 80 or lower means your battery is empty.
To restore the cells, you need to restore the chemical balance. Older batteries need to be checked and topped off with water. New batteries are different. They’re maintenance free, and you cannot mess with their components.
Why does my car battery only read 12.5V?
So it is possible that something is drinking all night and bleeding that voltage off. Depending on how you’re getting the 12.5v reading, that may not be where the battery is stable, i.e. the battery may not be holding all the juice needed, and may be shedding the amount it can’t store.
What does 12 volt mean on a battery?
If it reads 12.6 volts, the battery is just attaining a fully charged state. But when it reads 12.4 volts, the battery has attained a 75% charge level, and it could still be charged further, there would be no danger. With 11.90 your battery is low and in desperate need of a boost. 80 or lower means your battery is empty.
Can a 12 volt battery be topped off with water?
Older batteries need to be checked and topped off with water. New batteries are different. They’re maintenance free, and you cannot mess with their components. On the other hand, older batteries lose water.