From owner-freebsd-acpi@FreeBSD.ORG Wed Mar 17 07:45:51 2010 Return-Path: Delivered-To: freebsd-acpi@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 53F911065672 for ; Wed, 17 Mar 2010 07:45:51 +0000 (UTC) (envelope-from j@uriah.heep.sax.de) Received: from uriah.heep.sax.de (uriah.heep.sax.de [213.240.137.9]) by mx1.freebsd.org (Postfix) with ESMTP id EF56A8FC17 for ; Wed, 17 Mar 2010 07:45:50 +0000 (UTC) Received: by uriah.heep.sax.de (Postfix, from userid 107) id A60181C; Wed, 17 Mar 2010 08:45:49 +0100 (MET) Date: Wed, 17 Mar 2010 08:45:49 +0100 From: Joerg Wunsch To: freebsd-acpi@freebsd.org Message-ID: <20100317074549.GC52442@uriah.heep.sax.de> References: <20100315062028.GC52442@uriah.heep.sax.de> <20100317070428.GA2924@server.vk2pj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20100317070428.GA2924@server.vk2pj.dyndns.org> X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E X-GPG-Fingerprint: 5E84 F980 C3CA FD4B B584 1070 F48C A81B 69A8 5873 User-Agent: Mutt/1.5.20 (2009-06-14) Subject: Re: Funny battery values (nx6325) X-BeenThere: freebsd-acpi@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Joerg Wunsch List-Id: ACPI and power management development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 17 Mar 2010 07:45:51 -0000 As Peter Jeremy wrote: > >Design capacity: 279 mAh > >Last full capacity: 279 mAh > Is this consistent or does it vary from boot to boot or if you > disconnect and reconnect the battery? Currently, my wife is on a business trip with that machine. Hopefully, I'll also get a statement about how long it lasts on battery once she is back ;-), and I'll re-check those values then. > >The battery is declared as 55 Wh, which would correspond to 5.1 Ah > >(probably 3 x 2 x 18650 cells). > > But is also over 3 years old. Almost everything you do to LiION > batteries makes their capacity drop. That's right, but it wouldn't be supposed to affect the "Design capacity", would it? ;) Can anybody tell where these values actually come from? I could perhaps even build a small microcontroller gadget, in order to query the battery for its values offline (using I²C aka SMbus) in order to see where the mistake might be. -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)