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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › NICAD Battery (High Capacity?)
07-19-2006 05:40 PM  14 years ago
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1drummer

rrApprentice

Brookhaven, MS USA

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NICAD Battery (High Capacity?)
I am flying a gasser with digital servos and 401 gyro, I ahve been told that nicads can't hold up to the dititals. I would like to stay with the sub-c nicads if I can find a higher than 2800 mah, I'm not wanting to complicate the setup with regulator and lipos unless absolutely necessary. BTW, I have the capability of field charging my setup to get me through the flight day if number of flights are the concern. I appreciate any advice you'all can provide.

Thanks
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07-19-2006 05:46 PM  14 years ago
nivlek

rrProfessor

Norfolk England

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Nicads are fine . In fact , with SUB C cells , either nicad or nimh cells can easily supply enough current for digitals . It is really only AA size cells , particularly nimh , that may not be able to supply enough current , depending on the impeadance of the cell .At the end of the day , it gets dark .
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07-19-2006 05:48 PM  14 years ago
JakeDaSnake

rrApprentice

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Hey, NiCd's max out in capacity about 2400mah in Sub-C size, you can go with NiMH and get a 4 cell car pack and just solder the cells up with a reciever plug... then you can get about 4200mah out of them... they can easily supply 50 amps to a car motor...

BUT the reason for using Lithium Ion is not for capacity, its for consistancy.

A 4.8v NiCD or NiMH is around 5.2-5.4 volts fully charged and starts to drop right as its being used and goes till the voltage of the cell is around 1.2 volts each and then it needs a charge...

A Li-Ion is 7.4-7.6 volts fully charged and stays above 7.4 untill its dead then starts to drop. Using a regulator that regulates it down to 5.2-5.4 volts lengthens the time even farther...

Put it this way my 2400mah 7.4v Li-Ion lasts twice as long as my 2700mah 6v NiMh...

Hope I helped ya some,
Jake
Jake Wiggins: AMA 856496
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07-20-2006 01:23 AM  14 years ago
JakeDaSnake

rrApprentice

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Here is a link to a 4200mah RX pack by Hobbico... you could use that or make your own...

http://www2.towerhobbies.com/cgi-bi...p?&I=LXMTX3&P=7

Later,
Jake
Jake Wiggins: AMA 856496
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07-20-2006 01:18 PM  14 years ago
1drummer

rrApprentice

Brookhaven, MS USA

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Thanks for all the responses, I am thinking about trying a NIMH sub-c 4000mah pack, it is common around here for the car guys, I'll just build the 4.8 version. Do you think that would hold up to the demand??
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07-20-2006 03:57 PM  14 years ago
JakeDaSnake

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Yea without a doubt... a 540 car motor is drawing around 35-40amps and some up to 50 at 7.2v, those cells will have no problem holding up to Digital servos...

Later,
Jake
Jake Wiggins: AMA 856496
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