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Old 01-19-2015, 02:26 PM   #1
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Spektrum RX

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Can a NICAD 4.8 battery pack be used with an AR8000 reciever? Usually put in five 10 minute flights then call it a day.
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Old 01-19-2015, 02:51 PM   #2
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Re: Spektrum RX


A 4.8 volt NiCad should work with the receiver. In terms of how much flying you will get out of a pack it is not the voltage but the amps that will determine that.

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Old 01-20-2015, 11:37 AM   #3
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Re: Spektrum RX

hi Bob,

Ditto what Chris said.

The specs on the ar8000 rx say it can be powered by 3.5 to 9.6 volts so a 4.8volt NiCad pack is fine.

Amperage capacity largely determines how long a rx battery pack will power the airborne electronics package.
For example if the airborne package draws 250 ma per hour, a 500ma NiCad pack should power the package for two hours; if the package draws 500 ma per hour, then 1 hour of service.

Anecdotally, in the 70s and 80s, we regularly flew .40 size, even .60 size planes with four servos, on 500-550ma, 4.8v. battery packs for 5 or 6 flights without worrying "too much".

AND, many of us would also have as part of our flight box equipment, an ESV - expanded scale voltmeter - with which to check the remaining capacity of the onboard battery toward the end of the day. The ESV would put a load on the battery similar to that of the onboard rx and servos - typically a low load of 250ma or high load of 500ma. These were analog meters and the needle, under load would either stay in the "safe to fly" area, move left onto the the orange "iffy" section or the extreme left red "do not fly" section.

In the last couple of r/c club swap meets, I've seen ESVs being offered for $3 to $5.

You can also google something along the lines of "how to make an expanded scale voltmeter", to learn how to modify either a cheap analog or digital multimeter to work as an ESV. Short version, to put a 500ma load on meter, put a 9 or 10 ohm, 2 watt resistor across the leads of meter and stop flying when the meter dips to 4.5 volts.

You can also just operate the rx and servo setup with the battery as you normally would, while watching tv and note time when the servos slow/quit.

Incidentally, cycling a new NiCad pack and at the beginning of each flying season a couple of times from full charge to depleted would typically - in my experience - recover about 12 to 13% of the battery capacity over not doing so. This can be done with "battery cyclers", such as Hobbico or Ace R/C brand, which I've seen also go for about $20 or $30 on resale or by your own simulation as above while watching tv.

There is LOTS of information on NiCad, NiMh and LiFePO4 battery chemistries as used in rc to power airborne rx/servo (and ignition circuits) on this site
While the leading/"bleeding" edge is with the LiFePO4 chemistries for these applications, IMHO, NiCad and NiMh continue to work ok.

good luck,
Newmarket, Ontario
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Last edited by michaely; 01-20-2015 at 11:47 AM.
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Old 01-20-2015, 08:52 PM   #4
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Re: Spektrum RX

Thanks for the response guys. I am just joining the 2.4 crowd after using NICADS since the 70's. I have,and use an ACE cycler plus the digital meter.
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Old 01-20-2015, 09:57 PM   #5
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Re: Spektrum RX

I still use a ton of FM and nicads Bob and will till my flying days are over.

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Old 01-21-2015, 08:35 AM   #6
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Re: Spektrum RX

You certainly can Bob.
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