# Advice 1: How to check battery voltage

Measure the voltage of the battery (battery) is very simple. It does not need to seek the assistance of specialists or to go to the service station. To judge the degree of charge of your battery, enough to know a few subtleties.
You will need
• - a multimeter or voltmeter DC voltage;
• - hydrometer.
Instruction
1
Measuring the voltage of the battery without nagruzki this drain leads connected to the output terminals. Now take a multimeter and set it to the limit "- 20V". This will allow you to measure the voltage value with maximum precision. The red wire of the device connected to the terminal marked "+", black to "-". The readings must be greater than or equal to 12.6 V.
2
If the voltage was less than normal, you should:1. To check the electrolyte density (not less than 1.26 g/cm3). If necessary top up with distilled water, thereby restoring the desired density.2. To recharge the battery.
3
The measurement values of battery voltage under negrophilia that you need to connect the wires to the output terminals of the battery, start the engine and set the rotation speed of 1500-2000 rpm, and turn on the high beam headlights. Next, similarly to step 1, measure the voltage on the output terminals. The readings should be within 13,9-14,3 V.
4
Depending on the results, we can draw the following conclusions:1. If the value of voltage less than normal, it means the battery charge is insufficient. However, you must make allowances for the age of your battery, as well as the mode of operation of the vehicle.2. If the readings were more normal, then your battery is recharged. In this case, it is necessary to produce partial discharge (until the voltage value reaches the norm).

# Advice 2: How to check battery tester

With a tester or multimeter you can clean a number of household measurement in the home, for example, to check the voltage in the socket, to determine the performance of the battery or accumulator, an electric light bulb.
You will need
• - the battery;
• - multimeter.
Instruction
1
Connect the probe of the tester to the battery: connect in parallel: plus to plus and minus to minus. Next, install the switch kind of works for values of "Amps – DC". To check the batteries, do not use position "volts".
2
To test battery voltage enable pull-up resistor. In the case when the tester is included in the voltage measurement, there will be a significant input impedance. And then the battery (almost no load) will show almost full or full voltage, for example, 1.5 volts. If it is faulty/unfit, when it is installed in any device, the voltage immediately starts to decline.
3
Set the switch kind of works on the tester in a mode of constant current (amps) at the maximum limit. On the multimeter, this mode will be called "test Mode DC voltage". Lock the battery for half a second, so you have time to fix the readings. Longer to keep it not worth it, it can cause a short circuit and adversely affect the operation of the power supply. Read the current device to determine the suitability of the batteries.
4
Draw conclusions about the health of the battery pack after the voltage measuring by the following characteristics. Current dvenadcatiletnih batteries shall be not less than two and a half amps, cheap finger show the result of 2-2,5 A, and those that are more expensive, for example, Duracell or Energizer, should show not less than 4-4,5 A.
5
If the measurement result is less than one amp, do not throw them away, use such instances in the remote control of media players or TVs. Also, remember that battery voltage is half a volt, and the battery is 1.2.
Note
Recharging of the battery may lead to increased consumption of water in individual elements of the battery, and also to premature wear.
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