Hello all
I have a futuba receiver that uses 4 AA rechargeable batter 650 MA. I like to know if I can replace it with 4 AAA 1200 MA batteries?
Does 4 AAA 1200 MA last longer than 4 AA 650 MA batt?


Thanks
Borna

Hello Borna,

I am confused...

Your receiver uses AA batteries and you want to replace with AAA batteries? There may be a problem getting them to fit. AAA cells are smaller than AA sized cells.

AAA size cells have difficulty, in spite of their optimistic labels, getting to 900 mAh of actual capacity.

If you are already using AA sized cells, just replace them with higher capacity AA cells.

Tom

receiver use a external battery (4 AA). But because of wight issues I want to use AAA. Even at 900 mAh, does it last longer than 4-AA 650 mAh?

Thanks
Borna

Hello Bona,

Yes.

Tom

B,
Not necessarily. There is more to battery duration than mAh ratings (even if they are accurate). The poster who recommended higher-capacity AA cells gives good advice.

There is a real good tutorial on NiCd and NiMH batteries at the Hangtime Hobbies (NoBS Batteries) website. It might be worth your time to read it. Pay particular attention to the parts about internal resistance in cells.

Personally, I avoid even AA cells in any airplane. My smallest plane is a .60 size airplane with a Saito .82 and it is flown on 2/3 A cells.

AAA cells airborne, in any but the smallest airplanes, seem to be a bit foolish to me.

Could be wrong.

I fly AA size 700 mAh NiCd packs and AAA size 720 mAh NiMH packs. They both work well in my 40 sized glow planes using 4 or 5 standard servos. They give about 60 minutes of total flying time with a safe reserve.

I prefer the AA sized NiCd packs - they last for many years while NiMH need to be replaced more often.