User Manual

used: in the transmitter socket the left pin is negative (black) and the right one is positive (red). Be
extremely careful about polarity. Check the polarity of any battery before plugging in.
The minimum practical battery capacity is about 800 mAh (milliampere-hour) but batteries in the
1500-2500 mAh range are normally used. These should give at least 10 hours of operation.
The Turnigy 9XR Safety Protected 11.1v (3s) 2200mAh 1.5C Transmitter Pack
This is the battery sold by HobbyKing specifically for the 9XR series of radios. It is a low cost, low
discharge rate Lithium Polymer battery which includes a regulator that is claimed to allow it to be
charged at a low rate while still in the transmitter. The charger used must deliver less than 0.3
Amps (300 mA) at 12 volts. If the battery is almost fully discharged and a typical 150 mA charger is
used, charging may take about 24 hours. The charger jack has the centre pin positive. This is the
same as Futaba chargers but opposite JR and Spektrum chargers.
Note that the 9XR radio has a 0.3Amp fuse in the charging circuit to protect the transmitter and
battery. This will burn out if subjected to a higher current and is difficult to change.
The battery may be charged outside the transmitter at much higher rates using a proper balancing
LiPo charger. The recommended charge rate is 0.5 C, i.e., 1.1 Amps, at which rate a full charge will
take about 2 hours. The maximum charge rate is 2.2 Amps.
Even though the battery (unlike other LiPos) can be charged in the transmitter through the charge
jack, balance charging out of the transmitter with a proper LiPo charger is strongly recommended.
Because the battery has a low voltage protection circuit that shuts off power to the transmitter at
between 9.6 and 10.0 volts, it is very important that the transmitter voltage alarm be set well above
that level: a setting of at least 3.6 volts per cell (i.e., 10.8 volts for 3s) is recommended.
“Any Old 3s LiPo”
Any 3S 11.1 volt LiPo battery that will fit into the battery compartment can be used to power the
transmitter. Such batteries must be charged out of the transmitter with a proper balancing LiPo
charger. At the recommended charge rate of 1C, charging will take about an hour. Note that
charging a regular LiPo with a NiMH or NiCd charger will destroy the battery and could start a fire.
To avoid the risk of battery damage or even fire and to ensure that enough energy remains to allow
a safe landing, it is recommended that the low voltage alarm be set to at least 3.6 volts per cell
(10.8 volts for 3s)
9XR Pro: Introduction to the Hardware: version 1 2