linux-kernel - Re: [ltp] Re: [PATCH v2] Re: Battery class driver.

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Message-ID: <20061102212032.GC4887@ucw.cz>
Date:	Thu, 2 Nov 2006 21:20:32 +0000
From:	Pavel Machek <pavel@....cz>
To:	Bill Davidsen <davidsen@....com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Shem Multinymous <multinymous@...il.com>,
	David Zeuthen <davidz@...hat.com>,
	Richard Hughes <hughsient@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dan Williams <dcbw@...hat.com>, linux-kernel@...r.kernel.org,
	devel@...top.org, sfr@...b.auug.org.au, len.brown@...el.com,
	benh@...nel.crashing.org,
	linux-thinkpad mailing list <linux-thinkpad@...ux-thinkpad.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [ltp] Re: [PATCH v2] Re: Battery class driver.

Hi!

> >Well, "Wh" measures energy and not power, and "Ah" 
> >measures electric charge
> >and not current, so it would be better to make that:
> >
> >capacity_*_energy  (Wh-based)
> >
> >and
> >
> >capacity_*_charge  (Ah-based)
> >
> >Also, should we go with mWh/mAh, or with even smaller 
> >units because of the
> >tiny battery-driven devices of tomorrow?
> >
> Having seen a French consultant with a Windows laptop 
> reporting mJ (Joules) I bet that came from the hardware. 
> And given that laptop batteries run at (almost) constant 
> voltage, could all of these just be converted to mWh for 
> consistency?

li-ions run from 4.2V down to 3.6V without problems, and you can use
them down to 3.0V. I've ran zaurus down to 3.3V, IIRC. That's quite a
big range.

-- 
Thanks for all the (sleeping) penguins.
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