Thread: PRS-650 Battery Life
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Old 02-18-2011, 04:48 AM   #18
delphin
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Posts: 434
Karma: 346901
Join Date: Dec 2010
Device: SONY PRS-650
Quote:
Originally Posted by poyraz View Post
elcreative,

Thank you for clarifying the actual lifespan of a reader's battery. It is good to know that Sony's battery is much more powerful that I previously presumed. But, can you please also explain, why a notebook's battery run out/die out far quicker than this 400 (or as in your explanation almost 800) charges? However, I have never been able to use a notebook battery for 2 years (minimum) , not one and a half year (maximum).

Secondly, I am enquiring about this battery issue just because, I am also a Hanlin V3 user. In that reader, if you standby the gadget and leave it for weeks, battery does not drain itself off. As far as I see, this reader is able to shut all its processes unlike to Sony reader 650. With an evidently superior technology than to Hanlin V3, I would like to reach such a great battery life span in Sony Reader. Why do you think, Hanlin V3 would have a better battery performance?

Thanks,
Forget the exact numbers for a moment.

In very simple terms . . .

A notebook computer uses MORE ENERGY, so if you use it every day, you can easily run the battery through ONE FULL CHARGE/DISCHARGE CYCLE EVERY DAY.

An e-book reader uses MUCH LESS ENERGY, so on an e-book reader like the Sony, IT TAKES A WEEK OR MORE TO RUN THROUGH ONE FULL CHARGE/DISCHARGE CYCLE.

At a rate of one full charge/discharge cycle a DAY a battery that is rated for 365 charge/discharge cycles will only last a year.

At a rate of one full charge/discharge cycle a WEEK the same battery rated for 365 charge discharge cycles will last about 7 years.

As to why the Sony may be using more power when sleeping -

The Hanlin may not be doing a true live-memory suspend, but instead may be going into some kind of hibernate mode or completely shutting down.

The older Sony readers did this. It uses a lot less power but takes much longer to "wake up".

With my PRS-650, because of the true 'suspend' mode (where the contents of SDRAM memory is preserved) it can wake up in LESS THAN ONE SECOND.

According to what I see on Wikipedia, the Hanlin V3 reader has a fairly limited SDRAM memory (only 32MB) so even if they are keeping the memory alive during sleep mode, it would use a lot less power then more recent e-readers like the Kindle 3 or PRS-650 (which have several times more SDRAM memory).

In any case, if you don't like the slight power draw of standby mode, you can just do a full power down.

If you do a full power down, the PRS-650 only takes a little over a half a minute to start up.
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