Leave eReader turned on (affect on battery life)

[crich70]

Originally Posted by HarryT

If you keep WiFi turned on, that's true, because "sleep mode with a blank screen" turns WiFi off, whereas normal sleep mode doesn't. If you don't keep WiFi on, the two modes are indentical.

It also might make (at least a slight) difference how bright your front light on the Paperwhite is as well. Though of course when it's in sleep mode the light doesn't show up as being on.

[JSWolf]

Don't forget that the touch part of the screen does use power as it has to be able to register when you've touched the screen.

Sony Readers turn off after two days of no use to conserve the battery. You can turn them off if you know you won't be reading for long enough.

[pentel]

Originally Posted by HarryT

The screen only uses power when it turns the page, but a reading device is a computer: the other components of it such as the CPU, RAM, etc, all use power, too. However, most modern reading devices automatically go into a very low power state when not actively in use. Some of them - the Kindle, for example - actually can't be turned off, but only put to sleep.

Glad that the Kobo e-reader can be turned off.

[jscarbo]

Kindle uses Li-ion polymer batteries. For maximum battery life, leave it in airplane mode except when you need to connect to the internet. In normal use, recharge it regularly by topping off every few days and try to maintain your charge level between 30% - 80%. In normal use, try not to let the battery drain completely. If you aren't using it, you should still try to recharge it every few weeks.

Unlike older ni-cads, li-ion batteries don't have a memory effect and don't require charging cycles, although there's some support for the idea that completely discharging them every month or so may be of some benefit. I don't bother trying to do this and have never found it worth the trouble. With normal use, the average life of Li-ion batteries is about 3 to 5 years.

This article contains excellent information about best practices to maintain Li Ion batteries: http://lifehacker.com/5875162/how-of...g-its-lifespan

Complete information about Li-ion and other rechargeable batteries can be found at Battery University: http://batteryuniversity.com/learn/a..._ion_batteries

[soulfuldog]

Originally Posted by JSWolf

Don't forget that the touch part of the screen does use power as it has to be able to register when you've touched the screen.

Have you just plucked this fact out of the air or is there any indication that the touch element of the screen is on or off during sleep? It's not like you can wake up e-ink ereaders by touching the screens after all?

[crossi]

How long will a fully charged kindle without a lighted screen and with wi-fi turned off maintain it's charge while not being used? I'm assuming I haven't recently added any books so no indexing.

[JSWolf]

Originally Posted by soulfuldog

Have you just plucked this fact out of the air or is there any indication that the touch element of the screen is on or off during sleep? It's not like you can wake up e-ink ereaders by touching the screens after all?

When your Reader is not in sleep or off, the touch part of the screen does use power.

[HarryT]

Originally Posted by crossi

How long will a fully charged kindle without a lighted screen and with wi-fi turned off maintain it's charge while not being used? I'm assuming I haven't recently added any books so no indexing.

A couple of months, easily. I've not touched my PW since I bought my T68 a couple of weeks ago. I've just looked at it now and the battery meter hasn't visibly shifted from where it was when I last used it.

[eschwartz]

Originally Posted by JSWolf

When your Reader is not in sleep or off, the touch part of the screen does use power.

Oh, really.

On what imaginary planet does that have relevance to us, here, now?

[MartyTX]

Originally Posted by derball2008

1) Can the screen "freeze" it shows the same page for a long period of time (say 1 hour or more)

An eInk screen image will not "freeze". Likewise, it will not "burn-in" an image into an eInk screen. Some eReaders display a "ghost" image due to an incomplete page refresh, but that is not "burn-in" and is temporary. No form of screen damage will occur.

[soulfuldog]

Originally Posted by JSWolf

When your Reader is not in sleep or off, the touch part of the screen does use power.

Sorry your reply in #17 made it seem like you were pointing out the touch screen still uses power when you pointed out the Sony switches itself off to conserve power. It's not doing so for the touch screen because it's already off anyway since the touch screen doesn't wake the reader up from sleep.

[crich70]

Originally Posted by soulfuldog

Sorry your reply in #17 made it seem like you were pointing out the touch screen still uses power when you pointed out the Sony switches itself off to conserve power. It's not doing so for the touch screen because it's already off anyway since the touch screen doesn't wake the reader up from sleep.

I know it doesn't wake mine up. I have to press the button on the bottom in order to bring up the window for entering my passcode and it only wakes up then when I type the right code # into the box.