Mggt cars often fail to start, and the batteries are rechargeable.

Look at what you said, it is the aging of the battery panel. I poured out all the electrolyte of the battery, added distilled water and activated it several times with high current. After charging for 4 ~ 6 hours, check whether the distilled water is turbid, pour it out, change the water, recharge it, and repeat it for 3 times. When I saw that the water in the battery was clear, I poured it out and replaced it with water with higher specific gravity, and the small current was full. It can be used for 2 ~ 3 years.