The goal for this thread is to be a listing of links to actual science rather than posts of armchair quarterbacks. Prefer short summaries and then actual links related to science-based battery charging strategies to maximize long-term battery life. Background: In the early days of NiCad batteries the guidance was to fully drain before charging, else the battery would have a 'memory' of its new lowpoint and thus shorten its energy providing capacity (duration) per charge. I am aware that Lithium-based batteries do not have this 'memory' behavior but I know it is common knowledge that modern Lithium-based batteries have a maximum number of charge cycles as do NiMH-based batteries. So, I'd like to see the science that shows that repetitive charges starting from somewhere between 50-80% SOC (State Of Charge) results in lithium-based batteries that have a longer life (total number of charge cycles) versus holding off on charging until SOC has dropped to 20-30%. One scientist says modern lithium batteries have a 2500-3000 cycle life. Does the science say a charge starting at 50% is ONE cycle just as a charge starting at 20% is ONE cycle? If that is what the studies show, then draining down to 10 or 20% before charging should be better than daily charging from 60-95%, resulting in a battery that lasts 15 years rather than 8. If you have come across science-based studies of this elsewhere, please post links here. Also, not sure how relevant Prii with NiMH batteries would be to Lithium's behavior, but if you find anything on those, it might be all that is available since Lithiums have only been in cars for about 10 yrs. Not much interested in anecdotal data such as "I've got a friend of a friend who has X hundred thousand miles on his/her ______ and still has the original battery". Thanks.