To remind you safe charging battery

Battery charging, please refer to the use of the charger instructions. In addition to following the instructions of the charger manufacturer, the following precautions shall be observed:
Wear appropriate eye, facial and hand protective equipment.
The battery must be recharged in a well ventilated place.
Connect the wire to the battery before turning the charger and timer to OFF to avoid a dangerous spark when connecting.
Do not charge batteries that are visibly damaged or frozen.
Connect the charger to the battery: red positive (+) connected to the positive end of (+), black negative (-) is connected to the negative end (-). If the battery is still in the car, please connect the negative pole to the engine block as the ground wire. And make sure the ignition and all electrical accessories are turned off. (for example, if the car has positive grounding wire, please connect the positive pole to the engine block).
Ensure that the connection to the battery charger without signs of damage or wear or loose.
Set the timer, turn on the charger, and gradually increase the charge rate until you reach the amperage you need.
If the battery fever, or have a strong gas, or ejected from the electrolyte, please reduce the charging rate or the temporary closure of the charger.
Before removing the connection, make sure that the charger is turned to OFF to prevent dangerous sparks.