Castle Thunderbird-9 counts the wrong number of cells - RC Groups
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Mar 04, 2012, 02:32 PM
Registered User

Castle Thunderbird-9 counts the wrong number of cells

When I plug a 2 cell lipo into my brand new Thunderbird-9 it counts out 3 beeps instead of 2 (as it should for a 2 cell battery).

The instructions say that the Thunderbird-9 should be in "Auto lipo detect" mode, but that is definitely not the case as it is counting 3 cells, and the prop hardly spins a full throttle.

Any suggestions? Is it a defective controller?
Can I reset it with my transmitter, without using "Castle Link", which I don't have?


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Mar 04, 2012, 09:04 PM
Registered User
tacx's Avatar
Unfortunately, I believe it is only a 3s ESC.
Mar 04, 2012, 09:35 PM
hass-alfed and bass-ackwards
carlsoti's Avatar
A T-9 should work just fine on 2S OR 3S. I've only tried programming a T-18, and failed both by stick and with the Castle Link. Is it possible you are overcharging your batteries, fooling the ESC to think you've got a very discharged 3S? Have you tried setting the throttle limits?
Mar 04, 2012, 10:56 PM
Registered User
I charged the 2C lipos at 7.4V so I don't think I overcharged them.

After looking at the troubleshooting section on the Castle web site it looks like there may be an issue with the controller...
Mar 05, 2012, 08:31 AM
Registered User
tacx's Avatar

Are you saying that the Thunderbird ESCs that say 3S on them will work with 2s? Just wondering, because I have a TB 54 and it just says 3s and nothing in the specs in regards to 2s?

I had this question myself awhile back and CCs site didn't answer it.

Mar 05, 2012, 09:04 AM
Registered User
Dr Kiwi's Avatar
Of course a TB9 will run with 2s....the MAXIMUM voltage is 3s... the TB9 is auto detect so it should set itself correctly for 2s if that is what you plug in.

I think you have an issue with throttle range.
Mar 05, 2012, 09:12 PM
Registered User
I had the same problem a few years ago with a T-18 - turned out to be a defective controller - Castle replaced it with no hassles - give them a call.

Good luck

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