Before beginning the charging operation, read the instructions that  come with the charger. Never attempt to charge a battery without first  reviewing the instruction of the charger being used. In addition to the  charger manufacturer’s instructions these general precautions should  be allowed: 

✔ Always charge batteries in a well-ventilated area and wear proper  eye protection. 

✔ Turn the charger and timer “OFF” before connecting the  charger’s cable to the battery to avoid dangerous sparks. ✔ Never try to charge a visibly damaged or frozen battery. ✔ Connect the charger’s cable to the battery; red positive (+) cable  to the positive (+) terminal and black negative (-) cable to the  negative (-) terminal. 

✔ Make sure that the cables to the connections are tight. ✔ Set the timer, turn the charger on, and slowly increase the  charging rate until the desired ampere value is reached. ✔ If the battery becomes hot or if violent gassing or spewing of  electrolytes occurs, reduce charging rate or temporarily  discontinue the charge. 

✔ Always turn charger “OFF” before removing the charger cables  from the battery to avoid dangerous sparks.