7.4v 4800mah Batt. In place of a 11.1 2000mah batt???  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> 7.4v 4800mah Batt. In place of a 11.1 2000mah batt???
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7.4v 4800mah Batt. In place of a 11.1 2000mah batt??? - 10/25/2007 5:22:54 AM   
flyierjon


 

Posts: 275
Joined: 11/6/2005
From: Genoa, IL, USA
Status: offline 		Ok question........ I have a LiPo Battery at 11.1v and 2000 mah in an eflite plane..... I am wondering if its ok to use a 7.4v 4800 mah battery instead?

Thanks Jon
       Post #: 1

RE: 7.4v 4800mah Batt. In place of a 11.1 2000mah batt??? - 10/25/2007 5:47:16 AM   
rmenke


 

Posts: 1827
Joined: 6/25/2004
From: Merced, Ca., CA, USA
Status: offline 		Jon:

First check the motor rating and see if it will handle 4 cells, regardless of the voltage. Then check the controllers specs. If the motor is ok, you still may need to use a CC-bec, Castle Creations has a good new one out. Stuff is getting tricky.

(in reply to flyierjon)
       Post #: 2

RE: 7.4v 4800mah Batt. In place of a 11.1 2000mah batt??? - 10/25/2007 8:52:21 AM   
mrasmm


 

Posts: 4422
Joined: 1/9/2007
From: Sometown, Northern Utah, USA
Status: offline 		unless I am wrong I think he wants to go from 3 cells to 2 cells, and from 2Ah to 4.8Ah. The total weight difference (assuming the same energy density between the packs) will be 160% of the 3s pack. The motor and the ESC will probably run on a 2s, but you'll want to check it for sure like rmenke was saying.

The other thing, and you'll probably have to just check it out, is that the plane isn't going to fly nearly as well, less voltage and more weight is gona make the plane alot more sluggish. If it's a sporty plane, it will still fly most likely, but it wont be very sporty, and it will have longer flight times. If it's something that is having a hard time staying in the air now, then likely you will not be able to run it on a 2s lipo in place of a 3s

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I don't always check every thread I respond to, so feel free to PM me

(in reply to rmenke)
       Post #: 3

RE: 7.4v 4800mah Batt. In place of a 11.1 2000mah batt??? - 10/26/2007 10:36:41 PM   
Ryan CSRC


 

Posts: 43
Joined: 10/18/2007
From: Ames, IA, USA
Status: offline 		Also, due to the decreased voltage, amp draw will also decrease. To get some of the 'sportiness' back you can but a bigger prop on it to get the amp draw back up. It is best if you have a watt meter when doing this to ensure nothing exceeds its limits.

Ryan Lefevre
www.CommonSenseRC.com
The Go To Guys For Electric Power

(in reply to mrasmm)
       Post #: 4

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> 7.4v 4800mah Batt. In place of a 11.1 2000mah batt???
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