Results of compression test:

Compression guage reading	Probable engine condition
Fails to climb during all compression strokes	Valve sticking open
20 PSI below normal	Faulty rings or valve seating
More than 20 PSI below normal	Faulty head gasket
20 PSI above normal	Excessive carbon built up in combustion chamber

1) Testing the battery:

Some maintenance free batteries do not have a charge indicator at the top. To find the state of charge measure the open circuit voltage. Measuring terminal voltage with a digital voltmeter usually makes this test. A battery with a OCV of 12.40 volts is charged enough for testing, if the voltage is less than 12.40 volts then battery needs to be charged.