Not true. Actually, the less capacity is utilized (of theoretical maximum), the longer will be lifetime of li-ion batteries. For example, if kept between 20%...

Not true. Actually, the less capacity is utilized (of theoretical maximum), the longer will be lifetime of li-ion batteries. For example, if kept between 20%...80%, they may last for 10x more cycles. That's why electric cars' batteries does not need to be replaced every couple of years.