Hi All,
I would like to replace one of my four standard s3004 servos to a high torque servo s3305 and also replace the 600mh battery to a higher capacity battery. I am not sure what the current draw is from the s3305 servo therefore not sure what size battery to use. Also any advice on the best type of battery to use would be great (Nicd, NimH, Lipo etc). This servo will be used in the rudder of a Goldberg Edge 540T ( 67").


Thanks
Graham

Use a battery with twice the capacity you think you might need.

Dr.1

Do you think 1200-1500mA is ok to use. This should give me more flights between charges?

You could fly all day on a 1600mAh 6V pack. of course I don't recommend it, but you could.

I use a 5 cell NiMH sub C pack in my heli and it last a LONG time. A NiCd pack will give a stronger amp rating, but the NiMHs now a days are very good.

Which is better Nicd or NimH?

Nimh has more capacity but can't provide sustained high current draw (most servos are ok but big electric motors may be too much for an Nimh)
That said, I am running a 6 volt 2,000 mah Nimh made by Hobbico ($29 at Tower) on my 1/4 scale RV-4 and despite its 7 servos I can still fly all day with no sign of a low battery.

Ummm, I believe high current nimh batteries are available.

Thanks, I did not know that

NP. I think part of the problem is several servos still say they should not be used with nimh batteries because they will exceed the current capacity of the batteries. From what I know, this is based on really old battery technology. The people running fast electric boats are pulling huge amounts of power from nimh batteries for their races.

If i am using a 1600mAh Nicd battery on my futaba reciever with a three s3004 and one s3305 servo should I change the wire gage of my charge switch.


Graham

Shouldn't be a problem.
Higher capacity just means it last longer, it won't draw any more current than the 600 mah.

Could I use the same charger that I have been using for my 600mAh battery to charge a 1500mAh battery?


Graham

Yes.

No problem.

If the battery is flat it will take longer to charge though.

Why does a flat battery take longer to charge than say a square one?

When he said flat he meant dead not the shape

Yes, by flat he meant that it had no power left in it,

Ken

Correct, I was NOT referring to the shape.

Thanks thats makes sense.

Next time "dead battery"