E T X T S O L I T H I U M B A T T E R I E S
180426
7
6)
Verify battery terminals are clean and terminal screws are properly secured (torque to
45in-lbs).
7)
Visually inspect the vent tubes to ensure they are not blocked (plugged, pinched or
kinked).
8)
Verify the battery box and or battery restraint system is in good working order. The
foam insert (190531)
is used to loosely hold the battery in a corner on the opposite
end of the box from drain hole (up to +-1/8” of movement sided to side or front to
back is ok; as measured at the bottom of the box).
9)
Test complete, record in Aircraft Logbook with inspection info or storage log.
Aircraft Charging System Maintenance Requirements
An annual inspection (check and/or test) is required for the voltage regulator and Over-
Voltage Protection Device (OVPD) or System (OVS) of the aircraft charging system for safe
operation of the battery and aircraft electrical system. The regulator and OVPD or OVS
may physically be separate devices or in a single housing. Follow the regulator and OVP
manufacturer’s ICA or maintenance instructions for annual checks and or tests.
Battery Charging
If at any time the aircraft will not start, or the battery seems low, or the voltage is less than
13.2 volt, charge it for the recommended time and charge rates shown below and disconnect
the charger when charging is complete. The recommended and maximum charge rate is
specified on the top label of the battery. Never exceed the maximum charging amps for
your battery.
This table shows typical charging times for the battery:
Model
Charging Amps
Charging Time
ETX900-TSO
5 amp (TM291 Charger)
3 hour
10 amp (TM275)
1.5 hour
Lithium batteries have a very low self-discharge rate which means the battery, if
disconnected from the aircraft, could “hold its charge” for over a year. However, some
aircraft may have systems that use a small amount of power with the “Master switch” off. In
those cases, we recommend disconnecting a battery cable from the battery during long term
storage (greater than 6 months).
Only an approved battery charger shall be used:
Optimate TM291 (5 amp) or TM275 (9.5amp)
If the battery has been over-discharged and “disconnected”, the voltage at the battery
terminal should be near zero volts if the battery still has a load on it. If the battery is
disconnected from the load it will automatically reconnect and the terminal voltage return to
> 9volts (remove the load by removing the positive or negative cables from the battery). In
