The rechargeable batteries inside the transmitter and the receiver pack must be fully charged prior to use. Plug the charg-
er into a 110V AC wall outlet. Next, connect the charger’s output leads to the Rx battery pack and Tx charge jack. The
respective charger LEDs will illuminate as you connect the charger to the batteries. Charge each battery for 15 hours.
The batteries may become warm as they charge. This is normal and a good indication that the batteries are becoming
fully charged. NOTE: The Tx and Rx batteries should be charged the night before each use.
If the batteries have not been used for several months, you may need to cycle them prior to use. Cycling is the process
of fully charging, then discharging, rechargeable batteries to help maximize their charge capacity and run time.To cycle
a battery, charge it for 15 hours, then discharge it by turning on the transmitter.The Tx’s voltage indicator should not drop
into the red zone (with the antenna extended) for 90 to 120 minutes. If it does, cycle the batteries again. If the batteries
still cause the voltage indicator to drop in less than 90 minutes after repeated cycles, battery replacement is recom-
mended. The old batteries should be disposed of at a recycling center.
BEFORE INSTALLATION PAGE 3
FIGURE 3
In cooperation with the
Rechargeable Battery Recycling
Corporation, Tower Hobbies encour-
ages proper disposal of environmen-
tally hazardous materials. The 4FM
contains rechargeable NiCd batteries.
Once the batteries no longer perform adequate-
ly, they should be discarded at your local recy-
cling center. Or, call 1-800-8-BATTERY for infor-
mation. It may be illegal to dispose of NiCd bat-
teries with common waste in your state.
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