From owner-freebsd-questions@FreeBSD.ORG Tue Nov 23 22:27:05 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 B6F21106564A for ; Tue, 23 Nov 2010 22:27:05 +0000 (UTC) (envelope-from xaero@xaerolimit.net) Received: from mail-yw0-f54.google.com (mail-yw0-f54.google.com [209.85.213.54]) by mx1.freebsd.org (Postfix) with ESMTP id 7BDE78FC12 for ; Tue, 23 Nov 2010 22:27:05 +0000 (UTC) Received: by ywp6 with SMTP id 6so738123ywp.13 for ; Tue, 23 Nov 2010 14:27:03 -0800 (PST) Received: by 10.216.16.85 with SMTP id g63mr1521598weg.114.1290551222412; Tue, 23 Nov 2010 14:27:02 -0800 (PST) MIME-Version: 1.0 Received: by 10.216.204.149 with HTTP; Tue, 23 Nov 2010 14:26:42 -0800 (PST) In-Reply-To: <20101123230908.5475dfe5@adolfputzen> References: <20093_1290549773_4CEC3A0D_20093_90_1_D9B37353831173459FDAA836D3B43499A7AF8D3E@WADPMBXV0.waddell.com> <20101123230908.5475dfe5@adolfputzen> From: Chris Brennan Date: Tue, 23 Nov 2010 17:26:42 -0500 Message-ID: To: Julian Fagir Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: 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: Tue, 23 Nov 2010 22:27:05 -0000 On Tue, Nov 23, 2010 at 5:09 PM, Julian Fagir wrote: > Hi, > > > I just looked into a batt for my daughters dell, her li-on lasted 14 > > months, now on "full" charge it only lasts 40 mins... Terrible. If you > > can get 2 years out of a batt ur lucky. I read some tech docs on li-on > > cells; if you can store at 50% charge in the fridge and when in use don't > > let it run down 100%. > in my opinion, there's just one rule: Don't trust anybody. > There are so many people who claim do be professionals, who say totally > contrary things. > On the one hand, there are many 'facts' which are falsely applied to > LiIon-batteries which don't apply. On the other hand, there are many > stories > people remember from years long ago or from cheap notebooks without an > 'intelligent' battery. > > Just to add another story from me: I have two batteries in my notebook, the > one is always drowned to zero before the other one is being used (no, there > are no possibilities to control that in my case). The one being drowned > first, though not that often used that hard (appr once a week) was nearly > dead after 1 1/2 years (6/23Wh), while the other one still has 23/27Wh. > > > Regards, Julian > Li-Ion batteries tend to loose there imprint (the ability to hold a charge) over time, the more the battery is discharged to 0%, the faster it will loose that imprint. There really isn't squat you can do about it except buy a new battery (and yes, make sure it is new, I bought a refurbed HP and the *full* charge for it when I got it was 20% of it's original capacity (maybe 15-20 minutes), good enough in a pinch but that 20% lasted maybe a month) As Julian stated ... there are too many people who claim to be professionals (I'm not one of them), this are just what I have experienced and based on what I have read. One resource I did find was http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries... they seemed to at least present all the information available in a logical order and it all made sense to me. hth, C-