Keeping li-ion batteries 100% full causes them to lose capacity faster, as does fast charging, high heat, noting many commercial li-ion chemistries in mass produced batteries are prone to fading capacity issues.
Look at Boeing 787 battery, Samsung Galaxy S7, Hoverboards, Tesla installing a titanium plate under some BEV models after it was proven that a electric car with lithium ion batteries that catches fire because the batteries have a problem, can be very difficult to extinguish with firefighting methods, and the very high DC voltages inside the burning EV also hazardous when Tesla model whatever get into an energetic highly mechanically intense road accident.
Many improperly designed or flawed manufacturing lithium-ion batteries are liable to catch fire while charging or discharging or from short circuiting if mechanically damaged or thermal runaway fire if overheated. Super Capacitors while holding less energy, can be float charged to full & cycled for tens of thousands of cycles without damage, vastly superior in terms of durability and long life than most lithium ion batteries.
Yet lithium titanate used in Citizen solar electric wrist watches can last 20 years or 55,000 cycles, but at only 2.4v Lithium Titanate not a popular li-ion battery in other applications. Some dash cams & solar electric wrist watches, clocks, long life compact information displays, calculators, low power portable electronic devices, can make use of a 2.4v Lithium Titanate cell with superior long life power storage & cycling than lithium cobalt oxide hard carbon, the kind of lithium battery used in a smartphone or tablet or laptop or that fade prone NMC NCA stuff that Tesla loads into EV sold in America while using longer lasting superior but less energy dense LFP in Tesla models sold abroad.
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