X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Jun 2010 08:20:51 -0400 Message-ID: X-Original-Return-Path: Received: from raven.ravenwebhosting.com ([72.9.254.67] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTPS id 4363450 for lml@lancaironline.net; Sat, 19 Jun 2010 15:27:19 -0400 Received-SPF: none receiver=logan.com; client-ip=72.9.254.67; envelope-from=paul@tbm700.com Received: from [184.91.36.208] (port=64977 helo=[192.168.1.105]) by raven.ravenwebhosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1OQ3gh-0003eY-KM for lml@lancaironline.net; Sat, 19 Jun 2010 15:26:43 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1078) Content-Type: multipart/alternative; boundary=Apple-Mail-142-168173571 Subject: Re: [LML] Re: Odyssey batteries with very limited warranties X-Original-Date: Sat, 19 Jun 2010 15:26:40 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <981785AE-1A86-4791-B078-5CA950C99648@tbm700.com> X-Mailer: Apple Mail (2.1078) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - raven.ravenwebhosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail-142-168173571 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 To avoid tossing a good battery you can do a test similar to that used = on our Concorde batteries. Take the amp-hour rating (C1) and draw a = load and measure the amps and time down to the threshold of 10v or 20v = depending on the battery. If we can get 80% of the rated A-H capacity = we keep it. But, we use a normal discharge rate in the airplane, not a = full draw at C1 as I think that is unnecessary. So, maybe something = like 20% of C1 discharging through some lights for example or a rate = that duplicates a discharge rate in the airplane in your worst condition = so that it will show up any faults under load. Take a measurement = every X minutes and get your capacity. I'd do it on the bench out of = the airplane and track the capacity between annuals. We previously tossed these expensive batteries based on calendar life = but we can now leave them on condition using these tests. Paul On 2010-06-19, at 3:01 PM, Robert R Pastusek wrote: > Robert Simon wrote: > =20 > Just had two of my four Odyssey PC680 batteries crap out after 2 years = of service although an identical set on the other buss are fine=85 > =20 > Robert, > I have a similar setup in my IV-P and had planned to replace two of = the four batteries every two years, expecting them to last for four = years=85but I never looked at the expected/advertised life; I was just = following a practice used for lead/acid batteries. Two of my batteries = are coming up on two years old; the other pair are coming up on four = years, and I=92d planned to replace them during the condition inspection = next month. I=92d appreciate your thoughts/experience on this. > Thanks, > Bob --Apple-Mail-142-168173571 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 To = avoid tossing a good battery you can do a test similar to that used on = our Concorde batteries. Take the amp-hour rating (C1) and = draw a load and measure the amps and time down to the threshold of 10v = or 20v depending on the battery. If we can get 80% of the rated = A-H capacity we keep it. But, we use a normal discharge rate in = the airplane, not a full draw at C1 as I think that is unnecessary. = So, maybe something like 20% of C1 discharging through some = lights for example or a rate that duplicates a discharge rate in the = airplane in your worst condition so that it will show up any faults = under load. Take a measurement every X minutes and get your = capacity. I'd do it on the bench out of the airplane and track the = capacity between annuals.

We previously tossed these = expensive batteries based on calendar life but we can now leave them on = condition using these = tests.

Paul

On 2010-06-19, = at 3:01 PM, Robert R Pastusek wrote:

Just had two of my four Odyssey = PC680 batteries crap out after 2 years of service although an identical = set on the other buss are fine