Spektrum SPM3100 DX3R - Manual (Page 5)

5 SPEKTRUM DX3R PROGRAMMING GUIDE
InsTallIng The baTTerIes
The transmitter requires 4 AA batteries: brand
name alkaline AA’s providing over 15 hours of run
time. Many racers prefer alkaline batteries over
rechargeable batteries, finding it more convenient
to simply replace the batteries when depleted rather
than taking the time to recharge.
Optional NiCd or NiMH 1.2-volt AA rechargeable
batteries can also be used. A charge jack located
below the on/off switch is provided for convenient
recharging.
Remove the battery door and install 4 AA batteries,
noting that the polarity of each corresponds with
the diagram in the battery holder. Replace the
battery door.
ChargIng
Charger Pigtail for Transmitter
Spektrum Transmitter Charge Jack Polarity
BLACK TO POSITIVE
BLACK W/WHITE STRIPE TO NEGATIVE
-
+
A charging jack is located just below the on/ off
switch. If rechargeable batteries are used, they can
be conveniently charged without removing them
from the transmitter using the charge jack.
IMPORTANT: All Spektrum charge jacks are center
pin negative. This is the opposite of many chargers.
Before using a charger, make sure the connector
is center pin negative. This can be done using a
voltmeter. Also, unlike conventional radio systems
that use 8 cells to power the transmitter, the DX3R
uses 4 cells. This is due to the electronics being
more efficient. When charging, be sure to use a
charger designed for 4 cells (4.8-volt battery pack)
when charging the transmitter. Many racers simply
make a harness and use the same charger used to
charge their car packs but turn the current rate down
to 1 to 2 amps.