What is the voltage and charging voltage of a lead acid battery？

Nominal voltage:

The nominal voltage of a single lead-acid battery is 2V.

A common 6V battery consists of 3 cells connected in series, with a nominal voltage of 6V.

A 12V battery consists of 6 connected in series, with a nominal voltage of 12V.

Charging voltage:

Floating charge voltage: approximately 2.25V to 2.30V per cell (13.5V to 13.8V for 12V batteries).

Average charging voltage: approximately 2.35V to 2.40V per cell (14.1V to 14.4V for 12V batteries).

Discharge cut-off voltage:

The discharge cut-off voltage of a single battery is usually 1.75V (10.5V for a 12V battery).

Summary:

Nominal voltage: 2V (single section), 6V (3 sections), 12V (6 sections)

Charging voltage: float charge 2.25V-2.30V per section, average charge 2.35V-2.40V per section

Discharge cut-off voltage: 1.75V per section