Car Batteries

How do you know if your battery is dead in your digital thermostat?

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2011-10-31 15:31:11
2011-10-31 15:31:11

Remove the battery and check it with a volt meter.

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They beep to let you know your program was changed, or that your battery is almost dead.


If the battery will not hold a charge it more than likely has a dead cell. If the battery is over 4 years old, replace it.



Remove the battery and take it to an Auto Parts store. They will check it and tell you if it is defective.




Try start the car. Check the voltage.


the computer will shut off entirely


A Multimeter will tell you if a battery charger is working for a Canon digital camera. A Multimeter is an electronic measuring instrument that measures voltage and current.


turn the key, and if the interior lights don't come on or flicker, then its dead.


If your car battery is dead, you will not be able to start your vehicle without a jump using jumper cables. When the car won't start and the lights on the dash aren't working, it is most likely your battery.



No start? No turnover? No horn? No lights? Check with a voltmeter


Well you could buy a battery checker at walmart or at target or any were they sell those types of stuff


I just replace my battery less than 6 months, some how my car was out of power, I really don't know the battery really dead, and isn't there any more problem or not. if anyone have this answer pls email mail me at sweetrecipe@gmail.com. thanks a lot Ethan


I assume your battery is running down. If the alternator is defective the battery will never be charged properly. There are a few ways to diagnose this. Start the engine and with a digital volt meter set to the 20 volt DC scale check the voltage at the battery with the engine running. You should read from 13.5 to 15.5 volts. Any less and the alternator is defective. You can also fully charge the battery and then disconnect the negative cable overnight. If the battery is dead the next morning then the battery has a dead cell and must be replaced. You can also drive the vehicle to a local auto parts store where they will check the charging system. Most will do it for free.


Possibly. Charge the battery to 100% with a battery charger and then check the battery with a digital volt meter set to the 20 volt DC scale. If it reads 12.6 V it is fully charged, 12.4 it is 75%, 12.2 it is 50%, any less and the battery is dead. If it reads below 12.2 the battery is no good. If it will not take a charge at all it is defective. So all you can do is charge it and you will then know where you stand.


A battery that runs down overnight is normally caused by a dead cell in that battery. The only fix is to replace the battery. It can also be caused by any light that is left on, on the vehicle. Dome light, under hood light, trunk light, glovebox light, or even brake lights that our on due to a sticking brake light switch. A relay that is sticking can also cause this. Disconnect the negative battery cable and let the vehicle sit overnight. If the battery is still charged the next morning then you know the battery is good. If the battery is dead then you know the battery has a dead cell and must be replaced.


feel the top radiater hose and see if it gets warm, if not the thermostat is dead, if your head gasket has gone, check for steam coming from exhaust tailpipe.


It is dead when the car doesnt start. You can see warning sighs when your car takes longer to start, or when rolling your windows up or down takes longer than normal. If you fully charge the battery and it looses that charge over a 24 hour period, and you know there is nothing draining the battery, it has a dead cell. In some cases a battery with a dead cell will not even accept a charge.


When the magnet isn't allowing you to upload and the bracelet isn't vibrating.


the battery will not be recharged and will soon become inoperable or discharged {dead}


it should be replaced when it stops doing its job controlling the temperature and replacing the battery does not solve the problem or it is showing a digital error code that tells you it is defective. You may also want to test if it actually is doing its job but the heating or cooling unit may be broken. If you have more than one zone and you know what you are doing, you can switch it with a known working thermostat and see if the problem stays with the zone or it moves with the thermostat. That should tell you if the thermostat is broken or the system related to that zone needs maintenance.


Start the engine and using a digital volt meter check the voltage at the battery with the engine running. If the alternator is good you will read from 13.5 to 15.5 volts DC.


Something is usually on that you don't know about like an alarm could be draining the battery. However, If its not starting you should check the starter though. It will make you think the battery is bone dead.



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