02-09-2013, 11:29 AM | #16 | |
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In the comparison with my kindle keyboard, I still don't see it as sacrificing because the Paperwhite performs a function that my other kindles don't. I think you have to take that into account. What's more important to you, having a light, or having longer battery life? It's not a big deal to me at all to plug my PW in more than I would my kindle keyboard, especially since it means having the benefit of a built in light. So that's my take on it. Last edited by sparklemotion; 02-09-2013 at 11:36 AM. |
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02-09-2013, 10:45 PM | #17 |
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It's just one piece of bad manufacturing!
In many cases, people don't even see if the light is on or not. In such cases you might as well save the battery! I don't know how much the touch screen uses, but hope it uses very little, and turns off when not in use. More than likely, the touch screen uses more power than the screen light, when setting it below 3. Amazon knows they could have easily turned off the light. It would have made so many people worry less, in a society that has learned to preserve energy when they can. Maybe in the US it's less of an issue, but generally in the rest of the world, you also turn off a light when you leave the room, or don't need it. For many europeans (and asians, and perhaps other people in the rest of the world), leaving on a light, when leaving a room, is like leaving your car in a parkinglot, with the car keys on the door. It just does not feel right. Amazon does not seem to understand it, and despite the updates, hasn't yet addressed a 30 minutes programming error like this! |
02-10-2013, 05:36 PM | #18 | |
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It's an e-ink screen, so, none, any more than a piece of paper uses power to display print. It uses energy to change state (i.e. to refresh content), not to display: you can rip the screen right out of the device and it will stay displaying what it displayed last. (The capacitative touch layer uses a little power, but we're talking milliwatts.) |
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02-10-2013, 05:55 PM | #19 |
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This is one reason I've avoided purchasing one I only use my e-ink reader when I'm outside or in 'normal' pbook reading light.
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02-10-2013, 08:14 PM | #20 |
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I am constantly amazed by how different people's opinions of the PW battery life are. I keep the wifi on and my battery lasts a blink. Well, ok, 12 hours. Lots of blinks. But still, not very long.
So people say 'it's the wifi/3g'. But the battery on my KT was endless. Hence, it is the screen. But some users here seem to not have battery life issues. I am starting to wonder if my unit is just defective. But I charge it every other day... |
02-10-2013, 11:04 PM | #21 | |
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02-11-2013, 08:07 AM | #22 | |
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Amazon's suggestion that people leave the wifi on so they can receive OS updates is nuts in my opinion. I don't know anyone who does it, though perhaps people who are used to plugging everything they own in to recharge every night are happy to leave the wifi on 24/7. |
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02-11-2013, 09:21 AM | #23 | |
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What brightness do you have your screeen set to? The lighting uses many times more power at maximum brightness than at mid brightness-levels. |
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02-11-2013, 09:43 AM | #24 | |
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Plus, I like my books and notes to sync. So I don't ever turn it off. |
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02-11-2013, 09:46 AM | #25 | |
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I have tried somehow casually, but I get very inconsistent results. I think it has a lot to do with what/how I read. I noticed that on days I just sit down and read a book linearly, battery consumption is not high. But, on days I flip back-and-forth on the WSJ, the battery drains much faster during the same reading time. But one thing I know is that my reading habits were the same on my KT - and I used to get the same subscriptions. So I think that means that it is, after all, the screen that makes the difference. |
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02-11-2013, 12:51 PM | #26 |
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02-13-2013, 08:58 AM | #27 | |
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(Of course, if I had other devices and wanted the last-read-position syncing rather than just using it as a backup mechanism, I might value leaving wifi on...) |
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02-13-2013, 03:20 PM | #28 |
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02-13-2013, 04:29 PM | #29 |
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Hmm, You might be spot-on at 10 mW. I haven't found typical values for current draw by touch screen type. I see an example capacitive panel for sale at http://olink.en.alibaba.com/product/...uch_Panel.html claiming --
Deep sleep state current draw: 0.2 μA typical Low power state current draw 0.8 mA typical Active state current draw (continuous finger tracking): 8 mA typical I imagine IR touchscreens use more energy (enough to create and detect many criss-cross IR beams). |
02-14-2013, 02:43 AM | #30 |
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mA is something different from mW.
But then again, a touch screen uses less energy than an SD card drive. It is best to use the touch screen sparingly, by tapping. When you slide a lot to swipe pages, you're using more CPU, and touch screen power. It registers every point your finger goes on the screen. The less points, the less computation. |
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