MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR M-5-220C
Rev. B 36/38
This battery is considered fully charged at a hydrometer specific gravity reading of 1.265.
A low charge would be 1.225 or lower. Operating with a low charge will shorten the life of the
battery and can be prevented by recharging or operating with the electrical equipment turned off
until the battery has been sufficiently recharged.
To protect the alternator and battery from an overcharge, the voltage regulator should be
checked for a charging voltage of 13.7 to a maximum of 14.0 volts with the engine at rpm of
1000 or above.