Recommended replacement interval for the standby battery (P/N 9015607) is 3-years after the date of manufacture listed on the nameplate. The battery can be replaced by the user if desired.

The standby battery for Mod 0 contains lead, for Mod 1 contains Ni-MH. Recycle the battery in accordance with state and local regulations.

The standby battery should be kept charged by one of the following methods:

A. Float Charging (Continuous): Disconnect the battery from the indicator. Connect the battery to a constant voltage source, pin #1 positive, of 20.4 to 20.6 VDC continuously.

B. Routine Charging (Any given method, every 3 months minimum):

i. Plug the battery into the 4300 Electric Attitude Indicator. Run the unit overnight (approx. 15 hours) at the rated voltage.

ii. Disconnect the battery from the 4300 Indicator. Connect the battery to a constant voltage source (battery plug pin #1 red wire = positive) of 21.6 to 22.1 VDC with a current limit of 0.1 ampere maximum. After the first of a) eight hours, or b) when the charging current drops to approximately 5mA, the battery is fully charged.

iii. Charge the battery using Mid-Continent Instruments Battery Charger (P/N 36029) per its instructions.

A full battery capacity test must be performed at least on an annual basis, as well as any time there may be a question about battery performance (life).

Full Battery Capacity Test:

A. Disconnect battery pack from the 4300 Attitude Indicator.

B. Ensure the battery is completely charged and at or near normal room temperatures (20-25°C).

C. Connect the battery to a load of 90 ohms (rated for 10 watts) for 60 minutes while monitoring the battery voltage level.

i. If the battery voltage is above 15.0 volts at the end of the 60-minute battery capacity test, the battery should be capable of continued use after recharging is complete.

ii. If the battery voltage drops below 15.0 volts before the end of the 60-minute test period while under load, the battery pack is nearing the end of its service life and should be replaced.

D. Recharge the battery pack immediately. WARNING: The battery may be permanently damaged if it is left in a discharged state. Recharge a discharged battery as soon as possible and maintain with a float charge for maximum battery life.

Battery weight: Mod 0 = 1.0 lbs. ; Mod 1 = 10.5 oz.