02-13-2013, 12:06 PM | #106 |
Wizard
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We all measure our battery use time differently. We all have different battery units. We all have different ways of using our Kindles. Thus, there are no real tests we can apply to others.
I've read elsewhere on the internet that all Lithium batteries should be expended to zero on the first use to calibrate the meter icon and get all the chemicals stirred up. I've also read that after 3 years all Lithium batteries operate at only 80% of initial capacity. In addition, I've read that after 500 charges most Lithium batteries will be fully expended. For my own special uses I've run tests on the PW showing 10 hours of use with WiFi on and 12 hours of use with WiFi off. My KFHD7-32 measured by Gsam as the Screen Time right before a charge shows between 5 and 6 hours with WiFi on only for syncing and upgrading apps at the 14% leve over 7 to 8 days. My PW gets between 11 and 16 days with WiFi on only for syncing. My KK gets between 30 and 38 days. For me in the end I'll be dumping them all as soon as Amazon introduces the next generation which will probably be long before I notice any battery deterioration. I've read that the LI batteries we use now are 2D. Supposedly, later this year or next year 3D LI batteries will be out with ten times the 2D's capacity and 1/5th of the size. Of course that is all speculation right now. Last edited by sirmaru; 02-13-2013 at 12:31 PM. |
02-13-2013, 03:15 PM | #107 |
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The problem with Li batteries is that they are multiple cells.
Some cells may be in a better state than others. When a cell gets to a too low voltage, previously, the other cells would try to 'negatively' charge this cell; resulting in the cell exploding or leaking or expanding and breaking. Nowadays there are BMS controllers, (Battery monitoring systems), that will cut off bad cells, before they cause any damage. If for instance, 4 of 5 cells show 80% charge, and one shows 40% charge, and you keep on using the battery, without charging it, the bad cell may go downto a point of no return, where either the BMS will disable it, or it'll take forever to rebuild that cell to pump back some energy in it. A broken cell will never attain the same charge levels as before, even after charging it for a long time. Most of these issues happen when batteries are completely depleted. It's better to have an inaccurate battery meter, and charge your battery to full, than have an accurate meter, and destroy the lifetime of the cells. |
02-14-2013, 04:49 AM | #108 | ||
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Quote:
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02-14-2013, 08:27 AM | #109 |
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Li-Ion batteries are made to be used. There is just one thing you need to keep in mind:
"Avoid the extremes." Don't utterly deplete it. Don't keep it fully charged all the time. Don't make it extremely hot or cold. Don't knock it or drop it (because cells may break). If you have to store it, charge it moderately (halfway: it's not for nothing most devices come half charged) and keep it at a moderate temperature. For all the rest: just use it. For these batteries, it doesn't matter when you charge them or to what point. 15 to 100%, 25 to 73%... It doesn't matter. These batteries are made to handle that. The only bad characteristic is that they *will* lose power over time. If you subject the battery to the mentioned extremes, it'll go faster. I don't worry about this. By the time the battery becomes so bad that it's unusable (less than 2-3 days of power), then my Kindle PW will be 6-7 years old. Maybe older. That's old enough to try a cheap battery replacement, and if it fails, the reader can be replaced. Probably, the Kindle PW may not even be in use for that long. |
02-14-2013, 10:43 AM | #110 | |
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Links provided.
Quote:
http://www.southampton.ac.uk/~ssegro...atteries.shtml There are many more links if you google it. Here is one link to the 80% after 3 years of use: http://gemini-lights.com/explore/how...um-ion-battery Here is the link recommending draining a Lithium battery to near zero and then give it a full charge: http://www.wikihow.com/Calibrate-an-iPod-Battery Of course, that is only for the first cycle. After that it does not matter. Plus, if you use GSam Battery Monitor on the KFHD7-32, the stock battery icon is overridden by the GSam Percentage Number Icon so calibration is unnecessary. Actually, all this is IRRELEVANT for most of us. We buy a new Kindle EVERY YEAR so battery longevity will never be a factor at all. Thus, charge every hour or every month and it really does not matter. I have never owned a gadget more than 4 years - NEVER. If a Kindle battery fails in the first month, just send it back to Amazon for a no questions asked replacement. Their overall warrenty is one year. Plus, all this "logic" will be irrelevant once the new 3D batteries will be used, maybe even in the new kindles later this year. Their operation will be totally different than the 2D batteries. Its even possible that the 3D batteries will come with a numeric battery icon like the GSam one. I'd be very curious, does anyone on this Forum use any eReader over 4 years old on a regular basis? Last edited by sirmaru; 02-14-2013 at 11:02 AM. |
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02-14-2013, 10:51 AM | #111 | |
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02-14-2013, 11:11 AM | #112 | |
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3D batteries selling NOW!
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http://www.google.com/search?q=3D+ba...w=1024&bih=693 I just located that page in response to your question. Now I am very confident that new Amazon Kindles available this coming October will have them. I may even buy some for other uses once Amazon starts selling them. |
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02-14-2013, 11:13 AM | #113 |
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I see nothing there which is related to the type of research project that we were discussing before. But let's wait and see. Perhaps you're right and we'll see batteries with 1/5th the size and 10x the capacity in the next year - but I very, very much doubt it.
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02-14-2013, 11:17 AM | #114 | |
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They are selling NOW!
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http://www.amazon.com/NEW-HTC-BG8610...s=3d+batteries Its selling NOW. It has 56 five star reviews to only 26 one star reviews. This ONE 3D battery selling NOW makes me very confident the new Amazon Kindles AND, perhaps, a new Amazon Smart Phone will be using 3D batteries THIS OCTOBER. I can hardly wait. I'm a sure customer for both. Sorry about that link in my prior post. That was for 3D PICTURES - NOT batteries. This link is to a page where one can purchase the first 3D battery ever. It should be noted that the one star reviews show its initial defects. I'm sure Amazon will make sure their 3D batteries overcome the initial hurdles. Last edited by sirmaru; 02-14-2013 at 11:28 AM. Reason: Here is one good 3D battery selling now on Amazon |
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02-14-2013, 11:22 AM | #115 | |
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02-14-2013, 11:34 AM | #116 | |
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You are CORRECT
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Well, we can still hope that research gets into production by this October. From all the googling I've done on 3D batteries it appears the research, at least, is very far along. Last edited by sirmaru; 02-14-2013 at 12:55 PM. |
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02-14-2013, 11:36 AM | #117 | |
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02-14-2013, 11:46 AM | #118 | |
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Some 3D progress here.
Quote:
http://www.extremetech.com/extreme/1...er-than-normal "A group of Korean scientists, working at the Ulsan National Institute of Science and Technology (UNIST), have developed a fast-charge lithium-ion battery that can be recharged 30 to 120 times faster than conventional li-ion batteries. The team believes it can build a battery pack for electric vehicles that can be fully charged in less than a minute." Of course, that's for cars - not Kindles. I can see car manufacturers jumping on that one if those Korean scientists can deliver a production model. |
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02-14-2013, 11:52 AM | #119 |
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Again, I'm sorry to repeat myself, but there's a massive gulf between the research lab and the shelf of the local store. Look at all the promised devices in the reading world which have failed to make that transition - Plastic Logic is an excellent example.
I'm not doubting the fact that there's a lot of exciting research going on in this area, but you need to realise that research does not always translate into commercially viable products, and even when it does, the process generally takes many, many years. I honestly wouldn't get my hopes up of seeing a Kindle with new battery technology this October, next October, or even the October after that. You're going to be disappointed if you do. |
02-14-2013, 12:44 PM | #120 | |
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New 3D battery company
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http://prieto.everyperspective.com/a.../our-strategy/ Its a new startup company specializing in 3D batteries. It seems exciting to me. From that link: "Today, we are on the threshold of a major breakthrough. As a result of years of research, experimentation, and perseverance, we believe the Prieto Battery will be commercialized within the next several years." By the way, batteries are just part of the new innovations right around the corner for Kindles. Just compare my present PW and KFHD7-32 to my old Sony PRS-505 of several years ago and its like night and day. I couldn't even give that one away to anyone I knew. So I was forced to donate it to the local public library. I expect Amazon will have glorious new eReaders and maybe a Smart Phone for our enjoyment this October making our present Kindles look like totally obsolete models. Even batteries will improve without 3D. Just compare our present Lithium batteries today to the ones available just 6 years ago. Everything improves by leaps and bounds. Last edited by sirmaru; 02-14-2013 at 02:03 PM. |
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