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Use of Disimilar voltage batteries in series

Old 06-24-2008, 03:18 AM
  #1  
sbrv24
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Default Use of Disimilar voltage batteries in series

I am planning to use a Zippy K 11.1V 3S 4300 mah and a Zippy K 7.4V 4300 mah battery in series for acheiveing 14.8V 5S 4300 mah set up for my TP 35206T Motor with a Turnigy Plush 60A ESC with BEC .

I understand theoretically this is possible but would like some inputs on this cos I have mixed advice on this.
Sai
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Old 06-24-2008, 12:39 PM
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eflight-ray
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Putting them in series is no problem, though as you already stated they should be of the say type/capacity/rating.

A multi cell pack is just a set of cells in series, it's just done by the manufacturer instead of the modeler.

For anyone trying it, don't forget that the ESC must be rated for the extra voltage, and a separate BEC/battery will be needed as most ESC's with BEC cannot handle much more then 3s some 4s I believe.
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Old 06-24-2008, 12:54 PM
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sbrv24
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Thanks for the prompt reply .
The ESC I am using is :
TURNIGY Plush 60amp Speed Controller


Plush 60A Brushless Speed Controller
The plush series ESC are a very good quality controller. They have a broad range of programming features and a smooth throttle response compared to other BESCs in the same price range.
This BESC can handle 3A continuous current which is great for larger planes with bigger servos.

Cont Current: 60A
Burst Current: 80A
BEC Mode: Switching
BEC : 5v / 3A
Input: 5.6v-22v
Weight: 60g
Size: 80x31x14mm
Supported motor speed for all TURNIGY ESCs is;
(Maximum): 210000 RPM (2 poles), 70000 RPM (6 poles), 35000 RPM (12 poles).

So from the Input voltage range I think it can handle 18.5V max being 22( 6S).

What do you feel ?
rgds
sai
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Old 06-24-2008, 09:09 PM
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eflight-ray
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Sorry for the delay.

I don't know the ESC, but switching bec is usually rated for higher cell counts, it's the standard 5volt regulator bec that doesn't like more than 3s.

Yours states 5.6v to 22v, so as long as you don't over do the 22v by too big a margin, i.e. even when a 5s pack is full charged it shouldn't reach that, so I don't see any problems.

Just remember that any ESC needs cooling though.
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Old 06-24-2008, 11:54 PM
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radweld
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Isn't 5s 18.5v? you said you expected 14.8v
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Old 06-25-2008, 02:05 AM
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Old Sloppy
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I have a r/c boat with

1) flight power 5s2p 7400 cells
2) flight power 2s2p 7400 cells
3) flight power 5s2p 7400 cells

all in series, this gives me 12s 7,400 mah flight power battery.

connected to my Schulz 40-160 ESC and my Plett 370 marine brushless.

I have a (poor quality) you tube video.
[media]http://www.youtube.com/watch?v=lzBUmb9fYBY[/media]

Harry
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Old 06-25-2008, 02:10 AM
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Originally Posted by eflight-ray View Post

Just remember that any ESC needs cooling though.

Most ESC's need cooling.
ESC's exist that do not need cooling.
Schultz 32-170 is one...

Harry
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