For New Energy (electric) taxis, what is the best daily battery charging and maintenance practice to maximize battery life and prevent thermal degradation?

1. Always drive the battery down to 0% until the car stops before charging, and only use ultra-fast DC charging
2. Avoid frequent deep discharges below 10-20%, avoid leaving the battery at 100% state of charge in extreme heat for long periods, and periodically perform AC slow charging to balance battery cells
3. Charge the vehicle using ungrounded household extension cords in heavy rain
4. Store the vehicle in direct blazing sunlight with the air conditioner running on full power 24 hours a day