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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> Longer flying time?
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Longer flying time? - 12/5/2002 4:37:56 AM   
woodscra


 

Posts: 895
Joined: 12/10/2001
From: frisco, TX, USA
Status: offline 		Since mAh are mAh, is there some reason why the powerflite batteries would provide more flying time than Nimh on the same plane?

I have heard people comment on getting more flights than they did with either Nicd or Nimh, but I don't understand how that is so.

Would you please explain?

Thanks

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Craig
       Post #: 1

Longer flying time? - 12/5/2002 7:13:41 AM   
Red Scholefield



Posts: 5107
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline 		If you paid as much per mAh you would also brag about how much more time you got from them.

Now for the serious answer.
Lithium cells by nature have a more slopping discharge curve and their remaining capacity can be much more easily calculated from the voltage reading than can Ni-Cd or Ni-MH so they can run them closer to the edge.

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Red S.
AMA 951 Leader Member
Disclaimer: What I have written here are my thoughts and in no manner shape or form reflect the views of RCU

(in reply to woodscra)
       Post #: 2

Longer flying time? - 12/5/2002 11:54:52 AM   
Heads_Up



Posts: 288
Joined: 5/8/2002
From: Mesquite, TX, USA
Status: offline 		[QUOTE]Originally posted by woodscra
Since mAh are mAh, is there some reason why the powerflite batteries would provide more flying time than Nimh on the same plane?

I have heard people comment on getting more flights than they did with either Nicd or Nimh, but I don't understand how that is so.

Would you please explain?

Thanks [/QUOTE]

[QUOTE]Originally posted by redscho
If you paid as much per mAh you would also brag about how much more time you got from them.

Now for the serious answer.
Lithium cells by nature have a more slopping discharge curve and their remaining capacity can be much more easily calculated from the voltage reading than can Ni-Cd or Ni-MH so they can run them closer to the edge. [/QUOTE]

Thanks for fielding this one for me Red

I will get a little more detailed when I get into the office in the morning ... thanx again Red


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Heads_Up

(in reply to woodscra)
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Longer flying time? - 6/14/2003 10:53:36 AM   
Heads_Up



Posts: 288
Joined: 5/8/2002
From: Mesquite, TX, USA
Status: offline 		[QUOTE]Originally posted by Heads_Up
Thanks for fielding this one for me Red

I will get a little more detailed when I get into the office in the morning ... thanx again Red [/QUOTE]

Basically, longer time between charges comes down to our 7.2 volt batteries being regulated down to 4.8V ~ 6V.

Think of it as a "reserve fuel tank" for an RC battery system. RC planes run 4.8V ~ 6V electronics. A regulated 7.2V PowerfLite battery has 1.2V ~ 2.4V on "stand by".

Not only will this lead to longer times between needed chargers, but the user could see additional performance in his aircraft. I am not saying PowerfLite Batteries will make you a better pilot What I am saying is that during hard core maneuvers, where a lot of stress is put on the plane's servos, there should not be a drop in the voltage where it counts ... at the servo.

Rick Head
PowerfLite


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Heads_Up

(in reply to woodscra)
       Post #: 4

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