# How do you test specific gravity on a battery?

## How do you test specific gravity on a battery?

Specific gravity is the ratio of the density of the liquid being tested to the density of water. In the case of battery testing, the hydrometer is measuring the specific gravity of the battery’s electrolyte. The higher the acid concentration in the electrolyte, the higher the specific gravity.

What should be specific gravity of battery?

The specific gravity of the electrolyte in a fully charged cell should be from 1.280 to 1.300. If it varies more than 10 points above or below these values, adjust it by drawing off some of the electrolyte with a hydrometer and adding water to lower the gravity, or 1.400 acid to raise the gravity.

Which tester is used to checking specific battery gravity?

A hydrometer is used to measure the specific gravity of the electrolyte solution in each cell. It’s a tool used to measure the density or weight of a liquid compared to the density of an equal amount of water. A lead-acid battery cell is fully charged with a specific gravity of 1.265 at 80° F.

### How do you conduct specific gravity test of battery electrolyte?

Specific Gravity Test

1. Do not add water at this time.
2. Fill and drain the hydrometer 2 to 4 times before pulling out a sample.
3. There should be enough sample electrolyte in the hydrometer to completely support the float.
4. Take a reading, record it, and return the electrolyte back to the cell.

How accurate is a battery hydrometer?

A good hydrometer is accurate to +/- 0.005 points so 1.265 could read from 1.260-1.270. The instrument accuracy should be known.

What to do if specific gravity of battery is low?

When the specific gravity of a battery is low, it can be increased by making the battery electrolyte acidic since the more potent its acidity is, the higher will be the specific gravity. It can be done by adding battery acid into the battery.

#### What should a 12v battery read when fully charged?

12.6 volts
Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts.

What to do if specific gravity of battery is high?

What does a battery hydrometer tell you?

Hydrometers (density meters) measure the specific gravity of a battery’s electrolyte. Based on the specific gravity, the user can determine the state of charge of the battery. Retaining these hydrometer readings and data over time is recommended by IEEE as part of any Battery Maintenance Program.

## What is the value of the specific gravity of a fully charged battery?

1.265
The specific gravity of a fully-charged battery is 1.265 at a temperature of 80 degrees Fahrenheit (F).

How do you use a hydrometer to test a battery?

Insert the Hydrometer Press on the bulb that acts as a syringe. You should see fluid filling the hydrometer. Continue to squeeze the bulb until the battery electrolyte solution fills the device to the maximum level. This device tests each cell by measuring the specific gravity of the fluid.

How do you increase specific gravity?

ADJUST BY ADDING SUGAR Add corn sugar/invert sugar/ to increase the gravity. To calculate the amount needed, take an initial gravity reading, then subtract that from the specific gravity you wish to begin with. The difference will determine approximately how much sugar to add (use table below).

### How do you check specific gravity of battery?

Measuring the Specific Gravity of a Battery. Specific gravity is measured with a hydrometer. Simply draw the battery acid into the hydrometer so that the float is not touching the sides, top or bottom of the barrel. Take the reading with your eyes level with the surface of the drawn up liquid, and then subtract 0.004 for each 5°C…

What should be the specific gravity of battery?

Nothing in the battery world is absolute. The specific gravity of fully charged deep-cycle batteries of the same model can range from 1.270 to 1.305; fully discharged, these batteries may vary between 1.097 and 1.201. Temperature is another variable that alters the specific gravity reading.

What is specific gravity in batteries?

One of the key parameters of battery operation is the specific gravity of the electrolyte. Specific gravity is the ratio of the weight of a solution to the weight of an equal volume of water at a specified temperature. Specific gravity is the ratio of the weight of a solution to the weight of an equal volume of water at a specified temperature. Specific gravity is used as an indicator of the state of charge of a cell or battery.

#### What is the specific gravity of a car battery?

A fully charged automotive battery has a specific gravity of 1.265. As the battery discharges the specific gravity becomes lighter and more like water, closer to 1.000. The specific gravity of a battery is a good indication or its state of charge.