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I promise you battery circuits are smarter than that these days. We monitor battery voltage. If it drops too much, we start charging again. I'm really having trouble picturing a EE doing it any other way. * Drew Van Zandt Cam # US2010035593 (M:Liam Hopkins R: Bastian Rotgeld) Domain Coordinator, MA-003-D. Masquerade aVST * On Fri, Dec 28, 2012 at 9:21 PM, Rich Pieri <richard.pieri at gmail.com> wrote: > On Fri, 28 Dec 2012 20:04:42 -0500 > Jerry Feldman <gaf at blu.org> wrote: > > > Basically in general the worst thing you can do with a Lithium Ion > > battery is to run it all the way down, and most systems with shut down > > at about 20% > > Actually, this is the second worst thing you can do with a Lithium > battery pack. The worst is to leave it charging all the time: > > * Plug into charger. Monitoring circuit charges battery. > * Battery reaches full charge. Monitoring circuit stops charging > battery. > > At this point if you don't disconnect mains power then the battery is > not used to power the device. The battery pack will still self > discharge all the way to zero given sufficient time, typically 2 to 3 > months. The battery monitor circuit detects no drain on the battery so > it must still be at 100% and, since there is no power in the battery to > operate the device it will remain that way forever. Irreparably > destroyed battery pack. > > The last time I saw this in action was about 8-10 years ago. Had a > little notebook playing firewall. Left the battery pack connected as an > ersatz UPS. When the power really did fail, so did the notebook. > > Monitoring circuits are supposed to be "smarter" these days but better > safe than sorry. Don't leave it plugged in all the time. Use the > battery. That's what it's for. > > -- > Rich P. > _______________________________________________ > Discuss mailing list > Discuss at blu.org > http://lists.blu.org/mailman/listinfo/discuss >
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