at what voltage is aa battery dead?
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AA batteries start off with 1.5 volts of energy, but the voltage goes down as the batteries are used up. Once the batteries dip below 1.35 volts, they appear to be dead, even though they still have a lot of juice left.
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The battery must maintain a minimum post voltage of 9.6 Volts at 70 degrees F during the test to pass. If the voltage drops below 9.6 volts, the battery is “bad” and needs to be replaced.
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2) Take a Voltage Reading If your battery is: Reading 0 volts, chances are the battery experienced a short circuit. Cannot reach higher than 10.5 volts when being charged, then the battery has a dead cell. Fully charged (according to the battery charger) but the voltage is 12.4 or less, the battery is sulfated.
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If the ground wire is bad, then the battery cannot be charged. Of course, another reason for a dead battery could be issues with your alternator or the wire that connects from the alternator to the battery.
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Using a Multimeter to Test a Car Battery Set the multimeter to 15-20 volts. Turn the lights off. Connect the multimeter to the positive and negative battery terminals. If you don't have a voltage of around 12.6 volts, you may have a bad battery.
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Signs of a bad voltage regulator in a vehicle include dimming or pulsing lights or a dead battery. If you have electrical equipment that won't turn on, that could also indicate a bad voltage regulator—the regulator could either be letting no power through or letting through too much and damaging the other components.
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The easiest way to tell if a batteryisbad is checking the voltage it should be as stated. Another way is how the battery runs. If it runs slow for a long time then it could be bad. Try charging slow for a few time to see if the pack conditions.
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So when the engine is not running the voltage ranges between 12.9V and 10V as the battery discharges. When the engine is running the voltage is typically between 13.6 and 14.4 volts, depending on the alternator's load curve and the state of charge of the battery. Some cars can get up to 15V under normal operation.
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Starting the engine will require 250 amps for a half second, and the most current a 1.5-volt AA battery can produce is 10 amps. Given the above, you'd need to start with a string of eight AAs to get your necessary 12 volts.
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Re: AA vs 14500 Generally they are the same size. Or at least close enough that most would say that they are. It's voltage that is different. 4.2v resting for Li-ion vs 1.5 for an AA (or 1.2v from a rechargeable NiMh AA).
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Actually, AA and AAA are also 1.5 volts. That makes you wonder what the difference is. If they're the same voltage, why not just use all AAA batteries and make things lighter and smaller. But there is a big difference between them all.
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A standard 9V battery has about 400-600 mAh capacity. In the most basic terms, these batteries can supply about 500 milliamps for one hour before being "dead".
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Note voltage at 15 seconds and stop discharge. If voltage is less than 9.6 (normal temperature), replace battery. Fixed load test—Similar to BCI test except voltage limit depends on CCA rating. ... Many older-model battery testers cannot adequately test AGM batteries and could prematurely condemn a good AGM battery.
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A car battery tester should come with straightforward instructions. ... Around 12.7v is a good indicator of a fully charged battery. Below 12.4 volts, the battery will need to be charged. If the engine starts, it may be worth going for a short drive and checking the battery voltage again on your return.
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The power and longevity of a battery is noted by its Amp Hour (Ah) rating. Basically, this denotes how long a battery will last if it isn't recharged. For example if a battery is rated as, say 8Ah, it will be able to provide 4 amps for 2 hours. If a battery is rated as 100Ah, it will produce 100 Amps for 1 hour.
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The end of discharge for a lithium ion battery is usually between 2.5 - 3V per cell. ... When the battery is in this low power/sleep mode, you will not be able to read the battery voltage at that point and the pack will appear dead – voltage will be approximately 0V.
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Example 1: Testing Batteries This one is a AAA but a AA, C or D cell will be the same voltage. Set the range to 2V DC.