The best way to test the battery charge is to measure the density of the electrolyte in it.
An acidity meter is required to determine the density of the electrolyte in the battery. Before the measurements are started, the battery must be fully charged, and the battery must wait at least 6 hours.
The operation consists of the following steps:
1. Rubber gloves
2. Place the battery on a level surface
3. Wrap all battery pack stubs
4. Press on the rubber pear of acidity
5. Take the acidity and vertically omit it into the cell of the battery
6. Release the pear to the electrolyte
7. To pump so much electrolyte into the acidity so that the pressure range can float freely in it. When he calms down, he'll show the density of the electrolyte in the bank.
8. Repeat procedure with each battery
The normal density of the electrolyte shall be 1.24-1.29 kg/dm3.