The battery has been fully charged or is in good use, and there will be no electricity after 1-2 days.

There are 2 main reasons for this:

First, the battery shell is too dirty or the electrolyte overflows in the bumps, causing a short circuit between the cover and the pile head.

The second is that the battery separator is broken down or damaged, and the electrolyte is mixed with impurities such as metal dust. Or there are too many foreign objects deposited on the bottom of the YUASA battery tank, causing the internal short circuit of the battery. You should first check whether the appearance of the battery is clean.