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How to prevent my battery from getting full charge?

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http://forum.xda-developers.com – This question seems a little (a lot) odd. because naturally we want our battery to get fully charged to get the most stamina out of it. but i read a while ago that for Li-Io batteries the most efficient charge range are 10%-90% so basically that means the full charge -discharge cycles aren't good for the battery but harmful as it cause them to die faster.. anyway i considered this reading as a good theory until i bought a sony vaio laptop which had a battery preservation feature (it limits the maximal charge to 80% or 50% depending on the option) and for more that a year and a half my (HowTos)