Spektrum SPMAR9200 - Manual (Page 7)

Spektrum AR9200 7
EN
Battery Capacity (continued)
Recommended Guidelines for Battery Capacity
40-45% Aerobatic aircraft w/ 9-12 high-current servos: 4000–8000mAh
33-35% Aerobatic aircraft w/ 7-10 high-current servos: 3000–6000mAh
25% Quarter Scale Aerobatic aircraft w/ 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
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 battery charge condition
before each flight.
IMPORTANT: D0 NOT use a 4-cell 4.8-volt battery to power
the PowerSafe Evolution.
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 PowerSafe Evolution is capable of handling voltages from 6.0 to 10.0
volts. The voltage limitations are generally the servos. The output voltage
to the servos is regulated to 5.9 or 7.4V. Each voltage regulator is capable
of handling 10 amps, for a total of 20 amp maximum current capability.
Be aware that NiMH batteries have a tendency to false peak
when being fast charged. Be especially careful when using NiMH
batteries that they are fully charged and have not false peaked.
Many pilots are using 2-cell LiPo batteries to power their aircraft. LiPo’s
offer greater capacity for their size and weight, and are easier to manage
when charging.
Note: When a battery is connected to the PowerSafe Evolution, a low current drain of
less than 1mA occurs even when the switch is turned off. If the system is going to be
stored for any length of time, it’s important that the battery(s) be disconnected from
the PowerSafe Evolution to prevent over discharge.
Battery Voltage