Battery Selection - Turnigy 9XR-PRO User Manual

Battery Selection
Battery Selection
The 9XR radios require an input voltage between 6 and 13 volts, allowing use of many
different batteries. The main options are outlined below.
The 9XR battery connector is compatible only with a JST plug of the type used for the
balance lead on a 3s LiPo/LiFe battery. This means that such a battery can safely be
plugged directly into the 9XR. Other types of battery may require fitting a JST-XH 4 pin plug.
Only the outer two wires are 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.
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