35KV Substation: How to check whether the battery is normal in daily maintenance?

I'm a battery manufacturer. The battery should be discharged at least once every three months. In addition, use a multimeter to check whether the battery voltage is within the normal range (mainly to check whether the battery is short-circuited). In addition, pay attention to whether the battery leaks, and wipe it with a dry cloth if there is dust outside. You can ask me, I'm from a battery manufacturer.