Experienced car owners, is it necessary to buy a jump starter? Can a jump starter be used when the battery is dead?

How to start a car when the key fob battery is dead?

Can HiPhi's doors be opened when there's a complete power failure (including the battery being dead)? Is there a mechanical way to open the doors for emergency escape?

If I leave my car unused for three days, the battery dies. How long can your cars sit without losing charge? I'm thinking of getting an emergency jump starter. Could you recommend a good brand? Thanks!

Where can I buy a starter motor for the HFC4DB2-1D1?

What should I do if my car battery is dead?

Has anyone experienced a dead battery causing the anti-theft system to lock, and jump-starting didn't help?

Guys, need some help. My Hongqi EHS9 460 Flag Enjoy suddenly has a dead battery today, but it was running fine yesterday. Jump-started it and went to the dealership for a full day check, but they couldn't find the problem. Has anyone experienced something similar? Any advice?

The car battery is dead, how to lock the car doors? Currently, the mechanical key can only lock the driver's door.

Looking to buy an affordable and practical external power source for jump-starting a battery. Any recommendations, guys? [pleading face]

Can the Dongfeng T5 Evo be jump-started using an emergency power supply?