any merit in running dual battery packs ?

[J.Oddino]

Hi Dean,
This could be a problem if the current and voltage drop were both high.  In practice the battery voltage drops if you pull high currents so you don't see a 3 volt drop.  The thing that can cause a problem is dual servos on a surface fighting each other and tail rotor servos in helicopters.  I have not seen a problem in pattern planes  but a heat sink would help if you had a problem.  
Jim
  ----- Original Message -----   
  From: Dean Pappas 
  To: discussion at nsrca.org 
  Sent: Thursday, February 03, 2005 1:29 PM
  Subject: RE: any merit in running dual battery packs ?


  Hello Urs,
  The Jaccio regulator is a great item, but I am concerned about running with more than 3 volts of headroom: this increases the power dissipation.
  It may simply require a heat sink be added to the regulator component. That is usually just a tin or brass fin soldered to the big tab on the IC.
  Jim? Whadda you think?

  Regards,
  Dean Pappas 
  Sr. Design Engineer 
  Kodeos Communications 
  111 Corporate Blvd. 
  South Plainfield, N.J. 07080 
  (908) 222-7817 phone 
  (908) 222-2392 fax 
  d.pappas at kodeos.com 

    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Bärtschiger Urs
    Sent: Thursday, February 03, 2005 3:53 PM
    To: discussion at nsrca.org
    Subject: Re: any merit in running dual battery packs ?


    Hi Jim,

    Many thanks. I have the Jaccio already. I use it in conjunction with a 5 cell Nicad. Can I just connect it to a Li-Ion battery or are there prior readjustments to be made? TIA

    Urs 
    NSRCA #3069
      ----- Original Message ----- 
      From: J.Oddino 
      To: discussion at nsrca.org 
      Sent: Saturday, January 29, 2005 11:44 PM
      Subject: Re: any merit in running dual battery packs ?


      Hi Urs,
      I like the 18650 cells that are in the 2000 to 2400 mAh range now.  These are the cylindrical cells with metal cans like Central Hobbies sells.  I believe they are more rugged than the Li-Poly cells and one doesn't need to worry about taking them out of the plane to charge.  I use the Jaccio Perfect Switch Harness but I'm biased because I make them.
      Regards, Jim
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