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Lithium Ion have no memory whatsoever - it matters not whether you cycle the battery to flat between charges or you charge it every 20 minutes. They can also be drained completely every charge without harming them, *Jojo* your friend is mistaken. As for WSOD when completely discharging that is a problem with the phone and not the battery.
*however* lithium ion batteries do have a shelf life, which is an unfortunate downside. Internal parts in lithium ion batteries oxidise over time and build resistance, which gives the exact same symptoms as battery memory. This usually takes somewhere between 2-3 years and happens fairly quickly... it appears that the battery just dies overnight.
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Posted: 2007-01-10 04:32:43
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the k790a has a Lithium Polymer battery, not a Lithium Ion.
Whats the major difference between the two?
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Posted: 2007-01-10 04:48:09
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To the consumer? Not much. Lithium Polymer batteries are used mainly because they have advantages for the manufacturer. The difference is in the construction, not the chemistry... it's just that the electrolyte is a solid layer instead of a liquid solvent. They are much denser so the battery can be significantly smaller... and they don't catch on fire quite as easily (I guess that's a plus:) ) cause they don't use a volatile liquid.
Downside is they have a shelf life just like Lithium Ion, it's actually slightly shorter than a lithium ion.. Couple of other quirks, they charge a bit differently and they have a discharge point that should never be reached (3v), if you discharge on load beyond this the cell won't charge again. But your phone should be set up to handle all this stuff..
Basically they're just an advanced form of lithium ion battery, work pretty much the same just with a few minor differences..
first edit: typo!
second edit: NOTE: discharge point reference relates to lithium ion AND lithium polymer...
[ This Message was edited by: Astaroth on 2007-01-10 05:07 ]
[ This Message was edited by: Astaroth on 2007-01-10 05:13 ]
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Posted: 2007-01-10 06:04:22
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Something I forgot to mention about the shelf life - it has NOTHING to do with use. I found a reference that says a lithium ion battery at full charge stored at 25deg celsius will lose roughly 20% of it's capacity per year... so essentially even if it's cared for very well (not exposed to heat etc) it'll be dead in 5 years. So if your battery has been sitting in a warehouse for 12 months, it's already going to be sub-optimal.
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Posted: 2007-01-10 06:11:19
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Quote:
On 2007-01-10 04:48:09, BULL3TPR00F wrote:
the k790a has a Lithium Polymer battery, not a Lithium Ion.
Whats the major difference between the two?
Good that your phone has R3A016. If it was an older firmware then your k790 will be WSOD for sure. SE fix this (so I hope) with R3A016. And yes WSOD is not batt only problem but combination of faulty EROM and draining batt.
Well seems that Li-poly is more advance than Li-ion. The blow-up-batt problem seems to affect Li-ion and not Li-poly (that is what the local media told me anyway). Sony also seems to start mass produce Li-Poly for notebook (maybe difficult to make earlier because notebook batt is big compare with mobile batt) to replace those recalled Li-ion batt. Also fake Nokia batt (li-ion for sure) has the same problem.
When Li-poly first appear, ppl seems to say that it can be broken if you drop it (because it is liquid state? Li-ion seems solid?). Don't know whether they have fix this problem or not.
But I am not batt speasialist, so what I told you here is just some stuff that I heard. Anyway if you just follow my advice before then you will have a long batt life. My old T-68i, that my driver used, still use the original batt (4 years) before someone stole it 2 months ago. SE has good batt and my family own T68, T610, T630, S700, Z610, K800 and all is still using original batt. But still all batt has lifetime.
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Posted: 2007-01-10 06:15:01
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Quote:
On 2007-01-10 06:04:22, Astaroth wrote:
it's just that the electrolyte is a solid layer instead of a liquid solvent. They are much denser so the battery can be significantly smaller... and they don't catch on fire quite as easily (I guess that's a plus:) ) cause they don't use a volatile liquid.
]
Opps I probably mixed up which is liquid/solid, sorry. But yes one of them liquid based and one is solid. Anyway I am very pleased with SE batt performance.
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Posted: 2007-01-10 06:19:04
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Quote:
On 2007-01-10 06:11:19, Astaroth wrote:
... lose roughly 20% of it's capacity per year... so essentially even if it's cared for very well (not exposed to heat etc) it'll be dead in 5 years.
Do the math. It will not be dead in 5 years, since the 20% are relative. After one year, it has 80% left, yes. But after another year, it doesn't have 60% left, it has just lost 20% of the left capacity, so it has 64% left. A small difference there, but after five years, it actually still has about 33% left (0.8^5). Even after ten years, it still has 11% left. (OK, that's not much of a battery, but it works for a while anyway.)
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Posted: 2007-01-10 23:30:48
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wow thanks for the info guys, just learned a lot of great new info.
thanks for all the help
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Posted: 2007-01-11 07:09:29
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