... fully charged,the battery will limit the current automatically.3) Float chargeWhen the battery voltage reaches the setted float voltage(12V:13.5V,24V ... .1-0.3A.4) Stop chargeWhen the battery voltage reaches the fully charged point(12v:14v,24v:28v),it will cut-off ... to replace the fuse)Short-circiut protection3 Step Charger Diagram 12v/24v 5-30A battery charger 3 charging stages battery charger