X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 13 Dec 2005 23:15:34 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 880325 for lml@lancaironline.net; Tue, 13 Dec 2005 10:33:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m27.mx.aol.com (mail_out_v38_r6.3.) id q.28a.2271d69 (2519) for ; Tue, 13 Dec 2005 10:32:19 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <28a.2271d69.30d04382@aol.com> X-Original-Date: Tue, 13 Dec 2005 10:32:18 EST Subject: One last piece (or two) of SLA battery info. X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1134487937" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1134487937 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit SLA batteries have a self-discharge rate of about 5% per month. Deep discharges are not good but a few are no problem. Storage in a somewhat discharged state results in sulphation. The working lifetime of SLA batteries is typically 300-500 cycles, depending on the depth of cycling and the operating temperature. That is, the charge capacity slowly falls as the battery is cycled. SLA batteries are resistant to damage from minor overcharge. Conclusions: 1. Don't worry, be happy. 2. Use a float charger if the battery sits unused for long periods of time - like in the winter months or during hurricane/tornado season. 3. Even though the battery voltage test may be good. Consider the cycles count as a good way to estimate when to change batteries. In my case, my main battery is just over 3.5 years in service and I have landed with it 310 times. Since I don't do pattern work, landings are a good measure of "cycles". In many cases, mere age may not be a good measure of battery "lifetime." Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Merry Christmas to all! -------------------------------1134487937 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

SLA batteries have a self-discharge rate of about 5% per month.

Deep discharges are not good but a few are no problem.

Storage in a somewhat discharged state results in sulphation.

The working lifetime of SLA batteries is typically 300-500 cycles,=20 depending on the depth of cycling and the operating temperature. That=20= is,=20 the charge capacity slowly falls as the battery is cycled.

SLA batteries are resistant to damage from minor overcharge.

Conclusions:

1. Don't worry, be happy.

2. Use a float charger if the battery sits unused for long periods of t= ime=20 - like in the winter months or during hurricane/tornado season.

3. Even though the battery voltage test may be good. Consider the cycle= s=20 count as a good way to estimate when to change batteries. In my case,=20= my=20 main battery is just over 3.5 years in service and I have landed with it 310= =20 times. Since I don't do pattern work, landings are a good measure of=20 "cycles". In many cases, mere age may not be a good measure of battery= =20 "lifetime."

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Mer= ry=20 Christmas to all!

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