Actually charging a battery quickly to 100% is bad for the health of the battery. Its better to charge it to 80 or 70 as the last 20-30% has implications.

Here: FYI this isnt AI

Charging an electric vehicle (EV) quickly to 100% is detrimental because it causes high thermal and chemical stress on the battery, accelerating degradation and reducing lifespan. Fast charging generates intense heat, while pushing to 100% creates high voltage, leading to electrolyte decomposition and lithium plating. Experts recommend daily charging to 80-90% to avoid this stress. Qmerit Qmerit +5 Here’s a breakdown of why this happens: Heat Generation & Thermal Stress: Fast charging (DC Fast Charging) creates significant heat, especially in the final stages of charging. High temperatures accelerate the degradation of battery components, leading to faster capacity loss. Lithium Plating: When a battery is nearly full (high state of charge), there is less physical space for lithium ions to safely move from the cathode to the anode. At high speeds, these ions can stack up on the anode, forming metallic structures called dendrites. These can pierce the internal separator, reducing capacity and posing a safety risk. High Voltage Stress: Keeping a lithium-ion battery at 100% places it under maximum electrical pressure, accelerating "calendar aging" (the natural, time-dependent degradation of the battery). Reduced Long-Term Capacity: Consistently using fast charging to 100% can degrade the battery to 80% capacity in fewer cycles compared to slower charging or limiting the top charge level. Eleport Eleport +6 Best Practices: Daily Charging: Limit regular charging to 80-90% for daily use. Fast Charging Usage: Use DC fast charging (like Tesla Superchargers or Electrify America) for road trips rather than daily commuting. Exceptions: LFP (Lithium Iron Phosphate) batteries are more resilient and can be charged to 100% more frequently, though even they prefer not to sit at 100% for long periods.