Help with building a gimbal, advice on power supply please.

I have just received in the post two motors and fibreglass parts to build my own gimble frame for a small camera weighing up to 200gms.  I am still waiting for the Gimbal Controller to arrive from China.

While I wait for the Controller, may I please ask if it is best to connect the gimbal to its own battery supply, or let it use the battery which power's my newly purchased Iris, which arrived today?

If it is best to use an extra battery, then what size, strength of LiPo battery would I need?


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Please advise on battery strength to power a gimbal and small camera between 100-200gms.


That will depend on the requirements of the gimbal controller. Most have an on-board voltage regulator and are happy with 2S, 3S or 4S.

I just use a run off from my existing 12V BEC (already required for FPV). Clean, "weight free", and no added complexity.


I shall now reserch what a nicads is and think about adding one to my project.


On my alexmos compatible gimbal (2 axis) I use a separate 3S 1000mah battery. That is the same battery powering all of the fpv Equipment. I prefer a separate battery to avoid ESC noise or any other EMI conducted noise through the wires.

It is also a backup in case the main battery fails (I would keep FPV vision if I may say so)

Sorry, I missed the "Iris" part. For weight reasons you can just use power from your onboard battery. If you want best performance then I still say separate power supply from a small Nicad. 

Nicads are very heavy and most of our stuff is not "high discharge" unless your blowing your battery in under 5 minutes (I shoot for 25c max ).  I would never use a nicad in anything that flies .  Twenty years ago I did, but the only alternative was alkaline non rechargeable.


+1 for above, sometimes you need multi recover missions...Mr.Lemming..most controllers can use 3S and 4S and some 6S....yours I guess will be best on 4S,more S=more power

here is a few

Hi Mr Lemming,

As for me, I chose to connect to the main LiPo that powers my quand, using a 12V UBEC like this one.

(sorry it's in French).

Main advantage would be simplicity, but downsize is it pulls on the main battery (though I haven't noticed significant impact on flight time).

No ESC noise for me (as far as I can see).

Just one thing: when connected to a 4S LiPo, the UBEC can run very hot, so make sure you put it where it can be cooled and doesn't heat up other parts, or double sided tape, for instance ;)

As many said, typical AlexMos-like gimbal controller boards usually run on 2S to 4s batteries (although I've read somewhere that 4S was not really recommended - please don't ask why)



Thank you everybody for your help.

As yet I do not have the Gimbal controller yet, however when it arrives I will read all the advice again in ernest.

Another reason for asking about a battery is because I want to make a hand-held gimbal which will obviously need a power source of its own.

Thank you everybody.


A gimbal probably will work best at 2-3 S. 4 S is a little harsh (if the controller crashes, the motors could get pretty badly overloaded). I would run it off the flight battery if it is 3S for sim

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