From owner-freebsd-questions@FreeBSD.ORG Wed Nov 24 05:17:39 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5D16E106564A for ; Wed, 24 Nov 2010 05:17:39 +0000 (UTC) (envelope-from amvandemore@gmail.com) Received: from mail-fx0-f54.google.com (mail-fx0-f54.google.com [209.85.161.54]) by mx1.freebsd.org (Postfix) with ESMTP id E024E8FC08 for ; Wed, 24 Nov 2010 05:17:38 +0000 (UTC) Received: by fxm19 with SMTP id 19so7194174fxm.13 for ; Tue, 23 Nov 2010 21:17:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=KtW7Baoyy1jATk8jxfJYEu1SVWqANtFLn5s95xsxELM=; b=caPtEYtpTIvt7oNfCUafEKpzLTw3oUv2UupSASwIc/w8q5ZNvSlGlvbacbuZbLtSo8 8Li09fNoshAnmNf7mRi8NiiYD7GVqiHcFyHNARpoYHFVd2suJS4vT/VpWKbMTaF5Cy6F a5JFyQhpX3oWTP3XHqFwzQtvjI1Zly0P/LsZ0= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=BxMKQzEVET9RaM20oyB0lLLdzlGMf84VLfVGDF4Rp+U+OKQQgMT6ElA0PZo/gQsIo0 /GlAjq/yodD6Ph5iKzQ5rOedZC6MABammoX1edQblvuV1MguVpvvi14NKXsAhnIrUUUR l8ooM+CgUvkrfddo/oaMIp1hfPMAfofNojQBQ= MIME-Version: 1.0 Received: by 10.223.79.13 with SMTP id n13mr7607963fak.139.1290575857902; Tue, 23 Nov 2010 21:17:37 -0800 (PST) Received: by 10.223.121.138 with HTTP; Tue, 23 Nov 2010 21:17:37 -0800 (PST) In-Reply-To: <20101124144746.H37255@sola.nimnet.asn.au> References: <20101124024133.07F28106575F@hub.freebsd.org> <20101124144746.H37255@sola.nimnet.asn.au> Date: Tue, 23 Nov 2010 23:17:37 -0600 Message-ID: From: Adam Vande More To: Ian Smith Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: David DEMELIER , freebsd-questions@freebsd.org Subject: Re: How long laptop battery should live ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 24 Nov 2010 05:17:39 -0000 On Tue, Nov 23, 2010 at 10:55 PM, Ian Smith wrote: > > I'm guessing if this should be, the laptop has only about 8 months and > > I don't use it much on battery, only around one day per week and not > > until the battery is empty. If I remember correctly my old laptop > > didn't lost so much of capacity in a few months like that. > > > Yes 8 (or 15) months is way too soon to lose half its capacity, even if > you'd been running it on battery for a lot of the time. This old Compaq > laptop's battery (Li-ion, 14.4V) is at least 7 years old, and still runs > for about 1.5 hours, ie 40-50% capacity, and in a subtropical climate. > As already mentioned in a previous link you can't determine a battery's expected viability by age alone. The amount and way you've charged/discharged the battery will factor into it's performance along with other things. You should also consult the owners manual as battery characteristics will vary some. IIRC, there where some improvement to HEAD while ago that increased FreeBSD power usage efficiecy a non-negligible amount. Perhaps those improvements where MFC'd already, Google around either way as there are settings to tune which will decrease power consumption. -- Adam Vande More