[bookport] Re: Discharge rate for rechargeable batteries
- From: "Neal Ewers" <ewers@xxxxxxxxxxxxxx>
- To: <bookport@xxxxxxxxxxxxx>
- Date: Thu, 6 Oct 2005 09:42:42 -0500
Peter, First a question and then a comment.
1. what can you tell us about the Sanyo battery charger? Is it a
fast charger like the Radio Shack and Rayovac?
2. Comment. Because NMH batteries will discharge over time even with
no use, I'm guessing the number of hours people get will vary with the
use they make of the book port. If it goes unused for a while, the
battery life will continue to drop. But, who in the world goes for a
long time without using this nice little device?
Neal
Thanks for your help.
Neal
-----Original Message-----
From: bookport-bounce@xxxxxxxxxxxxx
[mailto:bookport-bounce@xxxxxxxxxxxxx] On Behalf Of ROB MEREDITH
Sent: Thursday, October 06, 2005 8:05 AM
To: bookport@xxxxxxxxxxxxx
Subject: [bookport] Re: Discharge rate for rechargeable batteries
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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