## Saturday, March 4, 2023

how to make a 12.6v battery indicator circuit

How to know quickly if your battery is still good or sufficiently charged? Find out in 2 minutes watch in hand thanks to a multimeter, which you will need to have...

First of all, if you buy one during this test, consider buying the battery that goes with it... Indeed, since it is generally a 9V square battery, there will generally be few chances are there's one lying around in case you forget it. I mention this because this is what happened to me.

Which mode to choose?

Two things to know, you have to put yourself in the direct current voltage position. Then you have to calibrate the voltage measurement on the multimeter: set it to 20 Volts because that best corresponds to what you want to measure (around 12 Volts). Be careful though because if you choose too small, you could blow the fuse of the multimeter...

Where to connect the red and black leads of the multimeter?

The red cable which must be connected to the (+) of the battery will connect to V (Omega) mA and the black cable will connect to the COM socket

Where to connect to the + and -? 2 Answers

On most cars, you simply have to connect to the + and - terminals of the battery, as you might expect. However, some higher-end cars have easier and quicker access to make your job easier. If you see a red cover with a + on it, then this means that your car

How to check the battery?

Turn on the multimeter in the voltmeter position with the settings indicated above. Then simply connect the terminals of the voltmeter to those of the battery, respecting the color code (the + and the -).

There are also boosters / testers on the market. Namely that they allow you to charge via a socket (sometimes there is an integrated battery) but also to test the charge as seen here with the red diode

Interpret the Voltage measurements taken

The voltage is less than 11 Volts: the battery is extremely discharged and there is a risk that it will never fully recover from this situation. It is then sometimes necessary to replace the electrolyte when possible (access by caps on the top of the battery).

The voltage is slightly less than or equal to 12 Volts: the battery is flat but it still has vital forces left to be able to start off on the right foot. However, it is necessary to act quickly because in this state the battery degrades rapidly and irreversibly (except replacement of the electrolyte).

The voltage is higher than 12 Volts: it still has juice but be aware that it is only 100% charged when it is at 12.6 Volts minimum (up to 13.5 full maximum). If for example it is at 12.1 Volts, the charge will be about 20%. At 12.3 Volts 50%, at 12.5 Volts 85% etc...

The voltage is greater than 14 Volts: be careful, it is too charged... The voltage regulator the alternator which must limit overvoltages must be out of service.

how to make a 12.6v battery indicator circuit

How to know quickly if your battery is still good or sufficiently charged? Find out in 2 minutes watch in hand thanks to a multimeter, which you will need to have...

First of all, if you buy one during this test, consider buying the battery that goes with it... Indeed, since it is generally a 9V square battery, there will generally be few chances are there's one lying around in case you forget it. I mention this because this is what happened to me.

Which mode to choose?

Two things to know, you have to put yourself in the direct current voltage position. Then you have to calibrate the voltage measurement on the multimeter: set it to 20 Volts because that best corresponds to what you want to measure (around 12 Volts). Be careful though because if you choose too small, you could blow the fuse of the multimeter...

Where to connect the red and black leads of the multimeter?

The red cable which must be connected to the (+) of the battery will connect to V (Omega) mA and the black cable will connect to the COM socket

Where to connect to the + and -? 2 Answers

On most cars, you simply have to connect to the + and - terminals of the battery, as you might expect. However, some higher-end cars have easier and quicker access to make your job easier. If you see a red cover with a + on it, then this means that your car

How to check the battery?

Turn on the multimeter in the voltmeter position with the settings indicated above. Then simply connect the terminals of the voltmeter to those of the battery, respecting the color code (the + and the -).

There are also boosters / testers on the market. Namely that they allow you to charge via a socket (sometimes there is an integrated battery) but also to test the charge as seen here with the red diode

Interpret the Voltage measurements taken

The voltage is less than 11 Volts: the battery is extremely discharged and there is a risk that it will never fully recover from this situation. It is then sometimes necessary to replace the electrolyte when possible (access by caps on the top of the battery).

The voltage is slightly less than or equal to 12 Volts: the battery is flat but it still has vital forces left to be able to start off on the right foot. However, it is necessary to act quickly because in this state the battery degrades rapidly and irreversibly (except replacement of the electrolyte).

The voltage is higher than 12 Volts: it still has juice but be aware that it is only 100% charged when it is at 12.6 Volts minimum (up to 13.5 full maximum). If for example it is at 12.1 Volts, the charge will be about 20%. At 12.3 Volts 50%, at 12.5 Volts 85% etc...

The voltage is greater than 14 Volts: be careful, it is too charged... The voltage regulator the alternator which must limit overvoltages must be out of service.