The 12V Force Charge Mode is exclusively designed for low-voltage batteries. When a 12V battery's voltage is between 0.3V and 2V, this means that the battery has aged or been damaged to some extent. Therefore, it may not be effectively charged with the 9-step charging process.
In this case, Sigma battery chargers can force charge your battery for 5 minutes and restore the voltage of your battery to a normal state as much as possible.
How to enter the 12V Force Charge Mode:
1) Connect the clamps/eyelets to the charger and to your battery.
2) Plug the charger into an electrical outlet. The icon of 12V Force Charge Mode will flash automatically when the connected 12V battery's voltage is between 0.3V and 2V.
3) Press the Confirm button to enter a 5-minute force charge.
Caution: This icon will flash automatically only when the connected battery voltage is between 0.3V and 2V and 12V, 12V AGM, or 12V mode is selected.
Note: Generally speaking, the battery voltage can be restored to more than 2V through the 5-minute forced charging after which the battery can be charged with the regular 9-step charging mode. However, due to the inconsistency in the degree of aging or sulfation of the battery, there is no guarantee that the battery will be restored to a good condition by a 5-minute forced charging mode.