[NSRCA-discussion] NiMH follow up

[John Pavlick]

Hey Matt what's up? I second that - Sirius is the way to go. I got rid of
all my other chargers (except my Alpha 4) when I started using the Sirius
Pro. The Sirius chargers use a pulse-reflex type charge algorithm. There is
a bit of controversy regarding this method but from my experience it seems
to work very well. YMMV but I don't think you'd be disappointed if you gave
one a try: http://www.siriuselectronics.com .
John Pavlick
http://www.idseng.com


  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
Rcmaster199 at aol.com
  Sent: Monday, February 27, 2006 9:51 PM
  To: nsrca-discussion at lists.nsrca.org
  Subject: Re: [NSRCA-discussion] NiMH follow up


  Gents, it has been stated before and always is worth repeating: one of the
best fast chargers for NiMH and NiCd is the Peak Electronics Sirius charger.
It plugs into the car's lighter socket and works at a couple charge rates,
500 and 1000 ma. It has built in detection and stops the charge when battery
is fully charged so no danger of overcharging with this charger.

  Ed's points below are on the mark. For more detailed information you
should visit Radical RC's website. Bob Thacker has much great info on care
and feeding

  Matt



  In a message dated 2/27/2006 6:41:04 AM Eastern Standard Time,
ed_alt at hotmail.com writes:
    Ed:
    Yep, 1/10C would be 220 mA for your 2200 mAh pack.  To condition a NiMh
pack when brand new, you do several conditioning charges at 1/10C.  You want
to go a full 24 hours at 1/10C, do a discharge to complete a cycle and
repeat for a total of 3 or 4 full cycles.  This will generally get you to
full capacity and also gets the cells ready to accept higher rate charging
and with the right charger, they will then start to give a reliable
indication of when they have peaked.  After these first conditioning
charges, you do not want to exceed about 16 hrs at 1/10C, though at 1/10C
it's a low enough rate that you're not going to damage it if you do go over.
Anything higher than 1/10C can shorten the life of the cells if repeated
overcharging is done.  The higher the rate and the more time it is
overcharged, the faster the degradation can occur.

    Ed


      ----- Original Message -----
      From: Ed Deaver
      To: NSRCA Mailing List
      Sent: Monday, February 27, 2006 12:57 AM
      Subject: Re: [NSRCA-discussion] NiMH follow up


      OK, for us non-electical whiz bang guys, please explain the C charge.
I have heard it before and tried what was suggested on RCU without success.

      My new NmHD pack is a 2200mah, 4 cell pack.  To condiditon it properly
for first flights what should I do?

      Does 1/10 C mean charge at 220 mah for 16 hrs??

      THanx for the explanation.

      ed


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