How is the working efficiency of lithium-ion batteries

Li-ion batteries have high energy density and high average output voltage. The self-discharge is small, and the good battery is below 2% per month (recoverable). There is no memory effect. The wide operating temperature range is -20℃～60℃. Excellent cycle performance, fast charging and discharging, charging efficiency up to 100%, and high output power. long lasting. It does not contain toxic and hazardous substances and is called a green battery.