Quote:
Originally Posted by mediax
I know that the SD card causes an extra drain on the battery, so allowing for the reading I've done it sounds like I might not have a problem.
I never paid too much attention to the battery life on my 505, but it feels like I'm spending half my life worrying about charging the 650! Maybe I should just relax and read 
 That's only going to make things worse though, isn't it?  |
Why do you beleive the SD card puts an extrat drain on the battery. IME (and through google searching) I can find no 'evidence' that having an SD card (or memory stck) permanently in the reader causes the battery to 'drain' or discharge faster.
Just the opposite in fact:
More likely it's because you're putting it in standby rather than powering it off between reading sessions.
Battery usage: Shutdown or Standby...
With a 4GB SD card permanently installed, and all the books (currently 608) loaded on the SD card. None in main memory.
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I have been recording the dates when I have charged my 650 since I got it in late September.
I have recharged it when the battery meter showed 2 bars or 50% charge used/remaining.
For the first three months I have been powering off the reader between reading sessions, for the lasy two weeks I have been putting it on standby between reading sessions.
Here are the dates it has been charged and the number of days between the charges:
Charge dates and days between charges:
Powering off/shut down reader between sessions.
(date format DD/MM/YYYY)
23/09/2010 - first charge, full charge overnight on date of purchase.
26/10/2010 - 34 days since last charge.
28/11/2010 - 34 days since last charge.
19/12/2010 - 21 days since last charge.
On standby between reading sessions.
31/12/2010 - 12 days since last charge.
Averaging 3 - 5 hours reading/usage per day.
So it would seem that the battery lasts longer between charges when powering off/shutting down between sessions rather than putting it in standby.
Over the lifetime of the ereader's lithium ion battery (3-4 years) the less it is charged the longer it should last. Lithium ion batteries usually have a 'lifetime' of 300 - 400 charges, so the less often it is charged the longer it should last ie 12 -14 charges a year (approx. monthly charges) with powering off the reader betweens sessions as opposed to fortnightly charge, 26 - 30 charges a year, when putting the ereader on standy between reading sessions.
I will be continuing to put it on standby for the rest of January to see what battery usage is like in standby mode.
https://www.mobileread.com/forums/sho...d.php?t=114061