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Old 04-29-2007, 08:34 PM   #1
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Question One more Battery related post

Hey guys,

I know plenty of posts regarding battery life, but I am curious if this little issue is normal.

This has been a very busy couple of months for work, and I havent had a lot of time to read. I plug the charger in occasionally overnight to keep it charged between readings. A week goes by that I haven't read, and a bar is missing. I do the reset the meter with the charger trick, seems to go to full bars until I open it to read at length, and the one bar goes down and stays down. I fully charge it again. If I hadn't read in a week, the same thing happens after a full charge and a week of non use.

A few weeks ago, I hadn't read at all in 2 weeks prior, and the meter was down 2 bars, which is leading me to believe reading or no reading, the battery will lose charge no matter what. I understand the slow discharge if I hadn't read in a month or 2, but this is only weeks. I also want to note that during long reading and heavy use, I don't lose any bars, this seems to be just a time with or without use issue.

So basically, I am curious if others have experienced this same issue. It seems that heavy reading dosen't move the bars for me, just time. I am looking forward to your responses, thanks.
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Old 04-30-2007, 03:24 AM   #2
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You would expect the Reader to use a small amount of power when it's "off", because it never really IS "off" - turning it off just blanks the screen and disables the detection of key presses. The operating system is still running - looking to see if you've pressed the power button, plugged in the charger, running the clock, etc etc.

I'd say, therefore, that what you're seeing is perfectly normal. I too find that the Reader will lose perhaps 1 bar of power in 10 days or so.
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Old 04-30-2007, 05:56 AM   #3
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I think with a card inserted it drains the power a bit faster than without. So you might try pulling the card out if you're leaving the Reader for a long time.
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Old 04-30-2007, 11:21 PM   #4
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Quote:
Originally Posted by igorsk
I think with a card inserted it drains the power a bit faster than without. So you might try pulling the card out if you're leaving the Reader for a long time.

No card in there, I had one at first, but when the drain began, I took advice from fellow Mobilereaders and removed it.
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Old 05-01-2007, 05:03 AM   #5
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The same here. I am loosing about 1 bar per week. So I never reach 7000 pages limit in one go. I think I never got more than 1000+ pages, because that is how many pages I read within a month.

Last edited by astra; 05-01-2007 at 06:08 AM. Reason: grammar...
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Old 05-01-2007, 05:48 AM   #6
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Man, I thought my battery was faulty but maybe I'm not reading enough.

I think I'm going to take the Reader apart tonight and measure what is the battery drain when in standby mode. If someone wants to know something specific please let me know so I can take a look/measure when I open it up.

Last edited by diabloNL; 05-01-2007 at 05:51 AM.
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Old 05-01-2007, 07:50 AM   #7
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Can you see if you can find the terminal connectors? If you need, I'll find the CPU pin info, but I hear the board is pretty hard to trace...
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Old 05-01-2007, 08:42 AM   #8
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Quote:
Originally Posted by igorsk
Can you see if you can find the terminal connectors? If you need, I'll find the CPU pin info, but I hear the board is pretty hard to trace...

If you have the pin info that would be great and I will check it tonight.
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Old 05-01-2007, 08:52 AM   #9
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Rechargeables do not stay charged.

I work with NiCads in my tools and it takes good charging management to prevent being marooned. I've read that NiCads typically lose from 4 to 8% of their charge per day with a deceleration of loss as it nears complete drain.

I don't know the particularities of the battery the Sony uses but I'm quite sure that this is the phenomenon that we're noticing in this case.
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Old 05-01-2007, 09:57 AM   #10
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Lithium Polymer that Sony uses can hold a charge quite good as far as I know. What I want to find out is what the standby current is. Tonight we will know.
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Old 05-01-2007, 02:27 PM   #11
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Here's the CPU info files:
Data Sheet (has the pin-out info).
Reference manual.
Product summary page (has more documents).
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Old 05-01-2007, 02:43 PM   #12
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Thanks for the info Igor. I will have to do it tomorrow because I left my tools at work.
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Old 05-01-2007, 05:17 PM   #13
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It seems from the data sheets that Sidd3 on page 18 (mislabeled as to be 150 MHz) is the standby power consumption valued at 35 uA.
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Old 05-01-2007, 05:27 PM   #14
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Well I opened it and tried to measure the current. Problem is that it's very hard to measure it. I needed a very, very thin wire to make a circuit and measure the current but I didn't have one at home. The only thing I could do on the spot was cutting the wire but that I found a bit going to far. I can do it but I will need some shrink tube so I can fix it afterwards.

I will give it a try soon but I need to set something up to do it correct. Igor, I couldn't find the terminal and I didn't dare to measure so close to the CPU. If I blow a port I have a big problem. One thing is for sure, you need to measure to find it.

What I did do is rip the "recycled" label from the battery and get the full type description.

It is a:

Sony Fukushima Sew
US473850 A7T
01C45NI22V

I found this type but only instead of "A7T" it ends with "A8T". I can't say what and if they are different.

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Old 05-01-2007, 09:47 PM   #15
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Quote:
Originally Posted by diabloNL
Igor, I couldn't find the terminal and I didn't dare to measure so close to the CPU. If I blow a port I have a big problem. One thing is for sure, you need to measure to find it.
Is it possible to check if the terminal contacts are present on the cradle connector?
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