Replacing your equipment’s battery is a simple job, but it’s important for your safety to do it the right way. Here’s how to remove an old battery and install a new one: First, mark the cables so you can keep track of which is positive and which is negative. Disconnect the negative cable first — be careful because both cables may still be hot. Next, disconnect the positive cable. Remove the battery and clean out the tray. Make sure the cable ends are free of corrosion. You can remove corrosion w