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Old 02-03-2013, 11:28 PM   #1
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okay to power a lt-40 size plane. Could a guy use cordless tool type batterys nicads or lithium.
I realize they may ne heaver than r/c batteries but I have a ton of the already in different voltages and amp hrs.
the other thing with NiCad is I can run them empty and not worry about harming them.
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Old 02-04-2013, 03:53 AM   #2
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Re: battery

Sure you can.

You will not get any where near the run time that you can get with a LiPo of the same weight. power to weight ratio of a LiPo is like four times or better. You also will not be able to draw any where near the same amount of current from a NiCad of the same weight. You would have to make a battery pack weighing like four times as much to get the same current capability out of a NiCad.

With the Low Voltage Cut-Off feature of a speed controller there should be no issue with draining a LiPo down too much. Use a speed controller that has adjustable LVC and set it at 3.2 volts per cell or higher and you should never harm your batteries.

The NiCad reqd to power a 40 size airplane with decent power and run time will be absolutely huge.
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Old 02-04-2013, 12:39 PM   #3
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Re: battery

I Have some of the li-ion power tool cells that work not bad. They don't have quite the power of the lipos so it takes 4 cells of li-ion to equal the power of the lipos. A little heavier but work very well Some are the Canadian made Emoli cells made out in BC.
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Old 02-04-2013, 12:43 PM   #4
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Re: battery

Most nicd drill batteries are 1300mah - 1700mah and can output maybe 5-10 amps. The quality is low and not like the cadnica cells used for rc cars years back.
The li-ion cells you get from the drill packs (non dewalt 30V LiFe) are good for 10-25 amps depending on who make them. Capasity ranges from about 1000mah - 1500mah.
I have a bunch myself but the power to weight is low. When I ran rc cars I use the cells out of a 3.0ah makita pack where weight wasn't an issue and they ran fine setup as a 2S4P.


If you're planning on way-overpowering your plane and "flying like a maniac", you might consider gluing the tail feathers down to avoid flutter.
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