SLA Battery Voltage Chart
For lead-acid batteries, you must monitor the voltage regularly. Each type of lead-acid battery has a typical voltage range. For instance: 6V battery: Operates around 6.5V when fully charged. 12V battery: Should show around 13.0V when fully charged. 24V battery: Ranges from 25.46V (100% capacity) to 22.72V (0% capacity).