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Originally Posted by Kelvin
My powerbook has a lithium ion battery, with everything you just described.
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Not true. Most laptops (including just about anything you buy at a Best Buy/Circuit City) do not have the circuitry to provide a float charge. They just use a constant charge to "maintain" and rely on circuitry built into the battery to keep it from frying. That circuitry is usually sub-par at best.
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Originally Posted by Kelvin
It's a lithium ion battery. It can be recharged whenever, and the more often, the better. The whole 'discharge until it's almost dead and THEN recharge it' only applies to batteries of a different technology, like NiCads.
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A LIon battery is good for about 400 full charge cycles. The major cycle is consumed from 55-95%. If you "Top Off" you battery when it is at 60%, it shortens the cycle lifespan as much as if you charge it up from 10%. The language they use is correct "400 full charge or 800 half-charge" but anything slightly over half charged counts as one cycle. Also, if you charge it from 10% to 65% it also subtracts a full charge cycle from the lifespan.