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Kindle battery life?

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Initial post: 3 Feb 2011 20:21:55 GMT
I Fraser says:
Hi All,

I have a new kindle, and am concerned it's battery is not lasting as long as it should. I've had it 1 week now, and have had to fully recharge it about 4 times so far. Over the last 2 charges I've recorded some details / timings:

31/01/2011 @ 18.04: very low battery warning, so I charged at the mains for 2.5 hours or so, until green light / full charge on kindle.

I read that evening (about 4 hours), and again the next evening (maybe 5-6 hours), then at 23.54 on 01/02/2011 another low battery warning. So out of charge after 10 hours or so.

I recharged again overnight at the mains, read for 6 hours on 02/02/2011, and for 2 hours this evening 03/02/2011, and again low battery warning popping up!

So my kindle is lasting around one and a half evenings (fairly heavy) reading....

The wireless / 3G has been switched off over both these intervals.

So my question is is this what other readers have typically experienced? Or might there be a glitch with my device?

Thanks for any feedback.

Posted on 3 Feb 2011 20:25:47 GMT
How many books have you loaded on the kindle from the off. I ask because when new, the Kindle does an awful lot of processing of the books (indexing every word for the search) and it uses a lot of power.

When I got a kindle, i had 50 books ready to sit on the device. I read it heavily and I charged it about 3 times in 2 weeks.

I am now charging, with wifi off, once every three-four weeks. If yours doesnt improve soon, you may have an issue.

Posted on 3 Feb 2011 20:47:19 GMT
I Fraser says:
Right, I've loaded a LOT of free books onto my kindle, getting it ready for a backpacking holiday - the reason I'm posting, as I don't want to be worrying about rationing my beach reading in case of battery run-down!

Guess I'll give it a bit more time, and see if things improve... Cheers for the advice!

Posted on 3 Feb 2011 20:52:55 GMT
Last edited by the author on 3 Feb 2011 20:54:32 GMT
Charlie031 says:
From new and in one month I've charged mine fully two times and I've read 6 books so its on quite often. It sounds to me like there might be a problem. Contact customer support (which is very painless and one of the best customer support services I've ever had contact with). They may suggest something or identify if this is abnormal.

Posted on 7 Feb 2011 12:39:29 GMT
i have had mine for two weeks and i have had to charge it twice i only have the 3G on for 10 mins at a time, may 10 times max. i do read for at lest two hrs a night. normally 4-5 hrs. i charged it over night on Weds and i am now down to 1/4 of battery. do you think this is about right? i have about 40 books.

Posted on 7 Feb 2011 13:05:43 GMT
MS says:
I've read six books since Christmas and recharged it three times but even then I didn't let the charge run really low. Sounds faulty to me.

Posted on 7 Feb 2011 13:36:35 GMT
wibblewobble says:
Hi Fraser
I have had my Kindle since October 18th. I am what may be called `an avid reader' yet my battery lasts between 3-4 weeks. My Kindle is the wifi model yet the wifi is only turned on for the couple of minutes that the device needs to download a book. All other electronic devices that I have purchased in the past have never lived up to the battery life that has been quoted, but the Kindle does.
I feel sure that there must be something wrong with your Kindle and I suggest that you send it back.

Posted on 7 Feb 2011 13:55:33 GMT
I'm sure there are bound to be a number of dodgy Kindles with faults - and the same must go for batteries. HOWEVER, this is just a few thoughts on (a) what could be causing a problem and/or (b) *MY* guess list of what eats battery power on the Kindle (It is just my guesses and I could be wrong and would welcome any corrections : )

a1 - Old unlit Amazon covers - Some of these had a fault on them causing a short, leading to unreliable Kindle performance across the board. If you have one of these cases try your Kindle nekkid - if this cures it, call CS;
a2 - Some USB adaptors seemed to have poor seating with the USB cable - make sure it is firmly in;
a3 - Charging via the USB on a pc is about 50% as fast as using the mains;
a4 - Some people have noticed that not all their pc USB ports actually charge the Kindle - try a different port or try using the mains adaptor;
a5 - Charging until the light goes Green is cool - but it does not hurt and can sometimes help to put it on charge overnight rather than just 2 or 3 hours (especially in the early days it seems)

b1 - When you download a book the Kindle INDEXs it, noting where each word is. This eats battery life. I GUESS 5 Kindle hours of reading per book indexed.
b2 - If your Kindle is cold (less than 15 C) it will perform sluggishly and use more power. I GUESS 2 kindle hours of reading for each hour actually read this cold;
b3 - Leaving wifi on when it is connected to your known and loved wifi signal does not seem to eat battery.
b3.1 - Leaving wifi on when the Kindle is not connected to a known hotspot will eat barrery life as the kindle will turn the power to max looking for a valid wifi connection - I GUESS 8 Kindle hours for each hour wifi is on and searching.
b4 - Talk To Me function eats batteries like a fat kid eats cookies. I guess 20 kindle reading hours per 1 TTM used hour.

I may (and probably am) wrong on some/most of these points - but maybe they point to something that you can fix and get back to happy Kindling :)

Posted on 7 Feb 2011 14:25:41 GMT
Kew says:
Thanks for all that info combat! I use text to speech fairly often so that explains why I haven't to charge mine every few days!

In reply to an earlier post on 7 Feb 2011 14:50:17 GMT
Ok thanks. i have just spoken to kindle support, very nice lady! she talked me though a down load and when i get home from work i will have to connect it to my laptop down load the files and email them to kindle support and an engineer will look at them tomorrow to see if there is a problem with the battery. thanks for your help!

Posted on 7 Feb 2011 17:23:56 GMT
ChrisJ says:
b3.2 - Leaving wireless on, when you have a 3G version, will use about 1 hour reading time for every 5 hours it is left on.
b3.3 - Leaving wireless on, when you have the 3G version, and the device is not connected to WiFi or 3G, will use about 5 hours of reading time for every hour it is on.

Posted on 7 Feb 2011 18:20:49 GMT
@Lorraine - Thank you for your feedback :) It's good to know they can actually investigate "remotely" as it were. Fingers crossed that the downloading stuff goes easily and that they come up with a result :)

@ChrisJ: Huge thanks - Had no idea about 3G so many thanks for your guesstimates :)

Posted on 14 Apr 2011 01:00:38 BDT
Last edited by the author on 14 Apr 2011 01:03:49 BDT
It seems that everyone omits a MASSIVE detail in their feedback. No-one states if they turn their Kindle off or leave it asleep.
Which consumes more power? Seeing as I've owned my Kindle a week today and ONLY JUST found out you CAN turn it off perhaps Amazon might want to address that particular bugbear.

Until about 5 hours ago I didn't even know I could switch the damn thing off.
Plus the battery charge indicator & monitor is poor, its awful to read. You can't even tell if its charged or how much charge you have, its FAR too small and not easy to read at all. Try fixing that too.

Posted on 14 Apr 2011 06:56:46 BDT
Last edited by the author on 14 Apr 2011 06:57:29 BDT
Clagg says:
Well, if you had read the user guide it does say that you can turn it off!

It isn't a bugbear. It isn't a problem. It isn't an issue. It is simply the fact that you missed it when reading the manual, if you did read the manual, of course. It is mentoned several times throughout the user guide at locations 311, 369 and 372. There are probably more but I think there's enough to keep you busy.

Posted on 14 Apr 2011 07:40:20 BDT
Last edited by the author on 14 Apr 2011 07:42:38 BDT
Ferret says:
Since it uses no power I believe to maintain the screensaver once it is in place it makes very little difference if you turn K off. Amazon only recommend that you do it if you do not intend to use it for a long time. Also my battery indicator is not at all hard to read unless I am not wearing my glasses. Could that be the problem? And let RTFM be your watchword at all times...

In reply to an earlier post on 14 Apr 2011 09:01:01 BDT
Damaskcat says:
It isn't that difficult to see the battery indicator and anyway you get a message in the middle of he screen when the battery needs charging.

A quick skim through this forum would have told you that Amazon recommend sleep mode unless you're going to leave the Kindle unused for more than a few days.

Posted on 14 Apr 2011 09:30:50 BDT
Clagg says:
I have never seen anywhere a bit where Amazon recommend that the Kindle be left in sleep mode, it is purely a user choice as it makes little difference unless you leave on Wi-Fi or have books indexing.

It has been thrown around the forums a lot, and has become folk lore, but if you have an official link to where Amazon says this it would be interesting to see.

In reply to an earlier post on 14 Apr 2011 09:41:07 BDT
Last edited by the author on 15 Apr 2011 08:39:25 BDT
Damaskcat says:
Clagg - I think someone did email Amazon way back and were told that it was best left in sleep mode - but of course my memory could be at fault.

Posted on 14 Apr 2011 10:41:23 BDT
Clagg says:
No worries, just interested where that tidbit came from.

I had an issue with a case a few months ago and sorted out a return and got chatting to a CS agent who basically said it didn't make a single jot of difference if it was off or in sleep mode in normal circumstances, you can do either way, unless, of course, the WI-Fi was on or the Kindle was indexing.

Posted on 14 Apr 2011 10:49:38 BDT
Ferret says:
CS basically said the same thing to me Clagg but recommended turning it off for long term storage. Not that Kindles get much of that.

In reply to an earlier post on 14 Apr 2011 11:00:59 BDT
Denis Powell says:
@ Clagg

I hesitate to say this, but you're not quite correct about the sleep mode issue. The Kindle User Guide says: "Sleeping your Kindle will extend battery life....."

That's at location 319 using Kindle for PC. It's in the paragraph immediately before 'Getting Assistance' in the early part of the Guide.

I think the idea is that it takes extra power to start the Kindle from "Off" compared with just waking it up. I suppose how much difference it makes depends on how frequently you do it, but mine's gone into sleep mode 3 time so far today and it's only 11 a.m.

Posted on 14 Apr 2011 11:36:03 BDT
Clagg says:
That is exactly one of those folk lore examples I was talking about; with the embryo of the idea coming from powering up computers, making it sound as it turning it on two or three times means it needs recharging. It apparently takes no extra power to turn on than it does to wake up from sleep.

The extends battery life bit was refuted by the CS agent as it misses the fact that indexing and leaving wi-fi on can drain it quite quickly, even in sleep mode the processor still draws some power as all it does is lock the keys, so therefore cannot extend battery life.

Not that any of it matters, if Wi-Fi is off and it is not indexing then the power drain is tiny anyway.

In reply to an earlier post on 14 Apr 2011 22:07:42 BDT
Denis Powell says:

You're quite right - have just done a little practical test (although not scientific) and I agree. I can't see that it takes a measurable amount of extra power to start from 'off'. I stand corrected.

I've not really taken much notice before as battery life seems to be good for the use I get from it.

In reply to an earlier post on 26 Apr 2011 23:49:32 BDT
[Deleted by the author on 27 Apr 2011 00:03:13 BDT]

Posted on 9 Jun 2011 11:21:06 BDT
Shizzzyb says:
I bought a kindle and noticed that I had to charge it 3 times in the first few days- so I took it back and they gave ne a new one- But if I had read this first I would not have taken it back as I have put 850 books on- and the indexing would have been draining- So now I know - thanks to everyone on this query
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Discussion in:  kindle discussion forum
Participants:  54
Total posts:  126
Initial post:  3 Feb 2011
Latest post:  28 Feb 2013

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