[bookport] Re: Discharge rate for rechargeable batteries
- From: "ROB MEREDITH" <rmeredith@xxxxxxx>
- To: <bookport@xxxxxxxxxxxxx>
- Date: Thu, 06 Oct 2005 10:49:15 -0400
Jim:
If you're getting 60 hours, you're likely doing the best you can. Of
course, there are lithium batteries; I don't know how many hours you
would get with them.
I used the same Book Port for over two years and never bent a contact.
I'm sure you'll be fine.
Rob Meredith
>>> fpardee@xxxxxxxxxx 10/06/05 10:49AM >>>
Hi list,
A comment and a question.
Since I got my Bookport last June, I have been using Panasonic alkaline
batteries, which I can get at the dollar store for 38 cents apiece. I
have
consistently been getting over sixty hours from each pair. Since there
may
be a problem with the contacts, it seems the fewer battery changes
the
better.
Now the question. Since we have been told that the flat side of the
battery
should be inserted first, how should it be removed? Should we pull up
on
the little cloth strip, or pull up the positive end first? It probably
doesn't make any difference, but it is something to think about in your
spare time.
Jim P
At 09:04 AM 10/6/05, you wrote:
>Peter:
>
>All of this is very interesting; it makes me want to go out and buy
>some Sanyo batteries. I don't know, but I am fairly sure I am not
>getting anything like that with Energizer 2500 MA batteries. The
reason
>I don't know is because of the way I use the Book Port. When you're a
>developer, you are always updating, resetting, leaving it plugged in
the
>the USB, etc.
>
>I suspect that to get 46 hours, you would have to play vertually
>continuously, as NIMH batteries discharge over time, even when not
used.
>Also, the bit rate would likely play a role, since higher bit rates
>would mean more reads from the flash card.
>
>Rob Meredith
>
> >>> peter.rand@xxxxxxxxxxxx 10/06/05 01:13AM >>>
> > how many mah hours [does] the bookport uses for reading & playing
>mp3s
>
>The last set of Sanyo AA 2500 mAh batteries in my Book Port lasted a
>little
>over 46 hours. The "change battery" warning sounded once the battery
>level
>had dropped to 1%.
>
>If we take the above as a baseline (2500 mAh = 46 hours of use), then
>we
>could assume that every 100 mAh results in about 110 minutes of
>operating time,
>or somewhat under two hours.
>
>This would result in the following usage:
>
> 800 mAh rechargeable batteries about 15 hours of operating
time
>
>1100 mAh rechargeable batteries about 20 hours of operating time
>
>1600 mAh rechargeable batteries about 29 hours of operating time
>
>2300 mAh rechargeable batteries about 42 hours of operating
time
>
>2500 mAh rechargeable batteries about 46 hours of operating
time
>
>The above are just estimates based on Sanyo 2500 mAh batteries.
>Discharge rates
>probably vary for different brands. I've had the best experience with
>the Sanyo brand.
>
>Peter
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