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With no load attached, a battery can measure full voltage (potential). However, as soon as a load is put on it (current s drawn), the internal resistance in a defective battery will also draw current thus reduce output. If this is a car battery, have your local service station or garage do a cranking power test; thisi will prove if the battery is good or not. Be sure to take you old defective battery to your local recyling depot as it contains lead (poisonous metal) adn corrosive Sulfuric acid). Cheers Malcolm
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What could cause a 1999 Regal LS to occasionally have a dead battery the battery and alternator test good?
Bad connection, connections to battery aren't tight.
What can cause a battery light to come on when the battery and alternator both test good on a 1992 SC 400?
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery.
Laptop won't turn on when battery is in?
Borrow an exact battery and test - original battery is likely bad.
Is battery scooters good or bad?
if you mean good or bad for the inviornment, its bad
How can you tell if the battery is bad?
Any Auto Parts Store will test your battery for free.
How do you tell if a battery is or is not working?
You check the voltage under load. Even a bad battery may have good voltage if no current is flowing, so you need an appropriate "test" load.
What would cause a good battery to not stay charged on a 1999 Ford Escort ZX2?
have the following checked: do a battery test to verify that the battery is good. do an alternator test, depending on the vehicle, it should show 14+ volts output, and have normal diode ripple. make sure the starter selenoid is good, sometimes a faulty selenoid will draw power. there may be a parasitic draw on the battery, have an auto electric shop trace the problem. == answer== check battery. if battery is poor replace also check starter. little known fact in fords that a bad starter will bleed and drain a battery giving bad indication that the battery is not good
Well alternator charges battery can it still be bad?
A good lead/acid battery will measure about 13.2 vdc. If that is happening it seems to be good. A load test at your local battery sales point would tell you if it is bad. There are amp probes that clamp on the battery lead and will show the current flowing. If the car is starting and you are seeing a higher than 13.2 vdc at the battery (switching to 13.2 when the battery is charged) then the alternator is working and the battery is good. Clean terminals are needed.
How do you know if battery is bad?
You can test your battery with a battery tester. If you don't have a battery tester, you could take the battery to Advance Auto Parts and they will test it for you for free.
If a 1992 F150 six cylinder was fine then wouldn't start but the battery is OK is this most likely the solenoid where is it and how do you test it?
The solenoid will be over by the battery, attached to the radiator support. But, it could be a bad ignition switch, bad battery connections, bad ground, or even the wire at the starter could be loose. You will need either a voltmeter (DMM/AVMM)or a test light. It would be good to have a friend help you out with this.
Can battery test good but be junk?
yes
How do you tell if it is the battery or alternator that is bad on a pt cruiser?
Start the engine and test the voltage at the battery posts with a voltmeter. If you get a reading of 13.5 to 16 volts DC then the alternator is more than likely good. Charge the battery fully and then have it tested at any auto parts store. They will test if for free.
