Spektrum SPMAR12200 - Manual (Page 6)

EN
6
Battery Requirements
Using One Battery
The Spektrum Cockpit allows the option of using one or two battery packs.
When using one battery, simply connect the battery into either of the two battery
connectors (BATT 1 or BATT2).
Using Two Batteries
The Spektrum Cockpit offers a true redundant dual battery system with built-
in dual voltage regulation. When using two battery packs, each pack functions
independently and is isolated from the other so that if one pack should fail (open
circuit, short circuit or become discharged), the other battery will provide power to
operate the system.
When using dual batteries, it’s important that both batteries be of the same capacity,
number of cells and ideally of the same age and condition. Keep in mind, however,
that it’s normal for one battery to discharge slightly more than the other. This is
the nature of an isolated battery system. The battery that has the higher voltage or
lower internal resistance will discharge at a faster rate. Generally, the difference is
negligible (less than 10%).
When using two batteries, the total available capacity equals the sum total of both
batteries, for example, BATT1 (2000mAh) + BATT2 (2000mAh) = a total capacity of
4000mAh.
Battery Capacity
It’s important to select a batteries that have more than adequate capacity to provide
the necessary flight time. Current draw varies depending on your servos, installation
and flying style.
Recommended Guidelines for Battery Capacity
Scale aircraft—The varieties of scale aircraft and the accessories they use vary
tremendously, making it difficult to give capacity recommendations for these types
of aircraft. Using the previously mentioned aerobatic guidelines, relative to the size
and number of servos used, will provide a conservative capacity for your scale
aircraft. As always, check the battery charge condition before each flight.
Battery Voltage
CAUTION: D0 NOT use a 4-cell, 4.8-volt battery to power the Spektrum
Cockpit. Four-cell, 4.8-volt batteries do not provide enough voltage headroom
(additional margin needed) necessary to power the system when heavily loaded.
Under load, the system voltage can drop below the voltage system’s minimum
operating voltage threshold (3.5 volts) and cause loss of control.
The Spektrum Cockpit is capable of handling voltages from 6.0 to 9.0 volts. The
voltage limitations are generally the servos. The output voltage of the servos are
regulated to 5.9 or 7.4V. Each voltage regulator is capable of handling 10 amps for a
total of 20-amp continuous current capability.
CAUTION: NiMH batteries have a tendency to false peak when being fast
charged. Always make sure NiMH batteries are fully charged and have not
false peaked during charging.
40–45% aerobatic aircraft with 9–12 high-current servos: 4000–8000mAh
33–35% aerobatic aircraft with 7–10 high-current servos: 3000–6000mAh
25% quarter scale aerobatic aircraft with 5–7 high-current
servos:
2000–4000mAh
Jets–BVM Super BANDIT, F86, Euro Sport, etc.: 3000–6000mAh
Giant-scale jets–BVM Ultra Bandit: 4000–8000mAh