Nick, From my experience, LiIon batteries are much easier to keep healthy than their NiCd and NiMH counterparts. The manufacturer of the batteries I work with (I'm currently working on the battery charger for a cell phone manufacturer) reccomends storing the cells in a charged state. The specification for this cell claims a 1/2C charge should remain after approximately 3.5 years after full charging. It more than likely will do more harm than good to cycle the cell when it isn't needed, the manufacturers usually spec approx. 500 charge/discharge cycles as the life of the battery. The end of life condition is considered to be 60% of original capacity remaining. The only real caveat to using LiIon seems to be temperature. You would probably want to check the spec for your particular cell, but generally charging outside of 0 to 45 deg. C isn't reccommended. Also the reccomend long term storage temperature range is in the neighborhood of -20 to 35 deg. C. I hope this is helpful. chap So speaketh Nick Masluk : > I'm somewhat familiar with what lead acid and NiCd's like, but what about lithium ion? My laptop has a litium ion battery, and I'm wondering, should i recharge it once it's at a low percentage, or is it best to keep it at a high state whenever possible? Should I periodically discharge it even when I don't really need it, or is it fine during periods of no use? Does it have any special requirements at all? I've seen very little information on lithium ion batteries on the net, I'm hoping someone in here knows a bit about the chemistry of the battery who can enlighten me. > > --Nick > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > -- Acid -- better living through chemistry. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics