Quote:
Originally Posted by Frogm4n
Yes, the charge controller will stop, but then it will also float charge at some percentage. So it will constantly go between something like 95-100% when left constantly on a charger. It's still racking up charge cycles even without using it. It's always best to let it charge and then disconnect it. Then if you don't use it, charge it back up every couple of weeks or once a month.
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Only ancient rubbish controllers. Decent ones will let it fall considerably. There is no concept of float charge on Lithium of any kind, only on Lead Acid (gel much much lower), NiCd and NiMH. Some NiMH have catalytic recombination, but still need a lower float current than NiCd. Higher capacity and all long life charge hold (like Eneloop) NiMH can only have a tiny float current, maybe a 1/10th of regular NiMH, which need to have less than NiMH.
An LiPoly on a decent controller will last 1 year to 10 years depending on cycles and quality. An LiFePO4 will now last about 4000+ complete cycles, which is why they are replacing other lithium tech in vehicles and everything for UPS and Solar (so maybe 12 to 20 years on current models).
Lead Acid Gel / SLA is the worst for deep cycles. Not even quoted on cheap ones.
Kindles do have the worst battery life time of any ereader or Android device I know, (for rarely used things) though it varies a lot because of cell quality.
Never leave in the car or on a windowsill or near a radiator.