Lithium or Not ?

[JOddino]

Not sure how small you are thinking about but they should behave similarly.  However, I'd recommend sticking with the 18650 cylindrical cells which are up to 2200 mAhs now.  The reason is safety.  These cells must go through extensive testing to prove they will not burn or explode. 
Jim
  ----- Original Message ----- 
  From: Richard Hallett 
  To: discussion at nsrca.org 
  Sent: Sunday, August 31, 2003 11:43 AM
  Subject: Re: Lithium or Not ?


  Can the same be said for the even smaller lithium poly?

  Rick
    ----- Original Message ----- 
    From: JOddino 
    To: discussion at nsrca.org 
    Sent: Sunday, August 31, 2003 1:59 PM
    Subject: Re: Lithium or Not ?


    Lithium Yes
    1) A system with a regulator is better.
    2) Li-Ion allows you to get better regulation at higher voltage.
    3) Li-Ion has lower self-discharge.  Charge on Thursday, fly on Saturday or the following Saturday.
    4) Charging is less complicated, not temperature sensitive and quite fast with cheap charger.  You can charge at the field if you need to.  The further the pack is discharged the faster it charges.  One hour assures you it is half full.
    5) Easier to predict remaining charge.  Therefore you can use more of the charge before recharging.
    6) Less maintainence.  No cycling, formatting, etc.
    7) Cells are better matched.  Bettor for paralleling.
    8) With the right system design switch, connector and cable drop is not a concern.
    There is probably more but I need to go to work.
    Jim

    ----- Original Message ----- 
      From: Bob Pastorello 
      To: NSRCA 
      Sent: Sunday, August 31, 2003 7:29 AM
      Subject: Lithium or Not ?


      I'm finding most 2 cell, 1600+ mah Lithiums to be weighing around 2.5 oz or so....plus a regulator (required), another .6, total of 3.1 oz.  And NO fast field charging.  And special charger.

      NiMh 5 cell pack, 1800mah, same reg reqd., about 5.8....

      Besides saving the 2.7 ounces (in my application), what are the REAL *other* advantages of going Lithium ?

      Bob Pastorello, Oklahoma
      NSRCA 199, AMA 46373
      rcaerobob at cox.net
      www.rcaerobats.net

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