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#Car battery indicator black how to#
#Car battery indicator black manuals#
#Car battery indicator black full#

This may cause the battery to explode! Remove the battery and take it inside so it can thaw before recharging or testing it. Warning: Do NOT attempt to recharge your battery if it has run down and the liquid inside is frozen. At -20 degrees, battery power is cut in half! At 0 degrees F, most batteries can only deliver about 65% of their normal cranking amps. The thicker the oil, the harder is it to crank the engine.Īt the same time, cold temperatures also sap the battery's ability to supply amps. , it can take 3X or more amps to crank the engine depending on the viscosity of the oil in the crankcase. At 0 degrees F, the number of cranking amps it takes to start a cold engine may increase as much as 2X. Oil gets thicker at low temperatures so it takes more amps to crank a cold engine when you try to start it. Why You Need a Good Battery for Reliable Cold Weather StartingĪ good battery is essential for reliable starting, especially during cold weather because cold weather increases the cranking load on the battery. Over time, this will lead to diminished battery performance and life.

#Car battery indicator black full#

Sulfation can prevent the cell plates inside the battery from accepting a full charge. If the battery is allowed to run down and is not brought back up to 75 percent or higher charge within a few days, the battery may be permanently damaged. This can be done by connecting a portable battery charger to your battery, or by driving your car for 15 to 20 minutes at 40 mph or faster.Īutomotive lead-acid batteries should be maintained at a 75 percent charge level or higher for best performance and life. If your battery voltage is less than 12.45 volts (75 percent charged), it is low and should be recharged. The photo at the top of this page shows a battery voltage reading of 12.29 volts, which means the battery being tested is low with only about half a charge. (NOTE: Subtract 0.024 volts for every 10 degree F drop in temperature)

Note the reading on your voltmeter and refer to the chart below: Battery Voltage and State of Charge (at 80 degrees F): The negative terminal will be marked with a minus symbol (-), and the battery cable that is connected to the negative terminal is often color coded BLACK. The positive terminal will be marked with a PLUS symbol (+), and the battery cable that is connected to the positive terminal is often color coded RED.Ĭonnect the BLACK or NEGATIVE voltmeter test lead to your battery NEGATIVE terminal.

To check your battery's state of charge, connect the RED or POSITIVE voltmeter test lead to your battery POSITIVE terminal.

You can use an analog or digital voltmeter, but a digital meter is easier to read and will give you a more accurate reading.įirst, make sure the ignition key is OFF, and all the vehicle's lights are OFF. The only way to know if your battery is fully charged or not is to measure the battery's state of charge with a voltmeter.

#Car battery indicator black how to#

#Car battery indicator black manuals#

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