Car batteries can spit or leak acidic solutions, and can sometimes explode or spark, so wearing protective clothing and glasses is advisable. Be sure to read the owner's manual of both the battery charger and your car model to find out more information on how to treat the battery. Set the volt setting on the battery charger to "12 volts." Almost all car batteries are 12 volts; if yours is not, then set the charger on the correct voltage--most Everstart chargers have options for multiple voltage types; but if not, do not use a 12-volt charger on a battery than is not 12 volts. You may also be able to choose the amp setting for the battery. This setting determines how quickly the charge will be passed on into the battery, and should be set as low as possible. A slow charge will take much longer, but will charge the battery much more effectively. [links]