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The best way is to test it is under heavy load at a battery dealership. They will have jump leads that apply a very low resistance across the battery,similar to the load of a starter motor. The terminal voltage of the battery is then examined under load. It should not drop by more than 1 volt.
Other checks are:-
Electrolyte level in each cell should be to line marked. Top up with distilled water.
Electrolyte specific gravity,tested with a hydrometer:- charged 1.100.Discharged1.000
Battery charger applied to it should read about 4 Amperes. If Ammeter goes over scale it is badly discharged and possibly have a shorted cell.
Check terminal voltage :- 12.5V good- 13.8 volts on charge.
10volts =1 cell gone and pro rata.
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∙ 14y ago
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Why does car needs jump to start in cold weather?
Take your battery to Napa and have them test the cold cranking amps, they'll tell you whether or not you need a new battery
How do you tell if car battery is good?
Drive to anyplace that sells batteries and the will load test if for free.
Car battery failed its test?
Then replace it.
What is the use of the automotive battery and how do I know if the battery needs to be replaced?
You can take your car to any car dealerships, auto repair shop, or AutoZone and they will be able to test the strength of your battery. AutoZone will test your battery free of charge.
Can a car battery have enough charge to turn the car electrics on but not start the car?
Yes, A car battery can have enough charge to turn on car electrical components but not start the car. This is not much of an indication of a bad battery however. Use a volt meter to test the power in the battery. If the battery seems low put it on a trickle charge. Most modern chargers will tell you if your battery is bad or not. The battery also has to be load tested to determine if it's good or not.
If car does not start and battery is good could it be the fuse box panel?
Take out one of the spark plugs. Check whether it sparks.
Does the battery on the remote need to be good for car to start?
If you are using it to turn on the car a good battery would help.
Trying to start the car with the bad battery before starting the car with the good battery can help avoid which problem?
you can avoid draining the good battery
How do you test car horns?
touch the wires to the battery terminal
Why does your car turn over slowly and barely starts when the battery is at 12.6 volts?
first of all if you have a good battery and im not saying you do but it could be fuel or air intake, your starter, or loss of compression.. but to test a battery you have to check it before you start your car then get someone to crank it and test it again because all battery will keep a surface charge but they loose that once a load is applied
How do you test a car battery by removing the ground wire?
Put the red test lead on the positive and the black test lead on the negative post of the battery and see the result.
Car not used for three weeks will battery start the car?
if the battery is good and charged sure
