Things You'll Need
10-mm wrench
Wire brush
Replacement battery

The car battery in the Honda Civic 98 LX supplies electricity to run the cars many electrical components. Many owners realize they have a problem with their battery when they find they can't start their car. If your Honda Civic's battery no longer holds a charge, replace the battery. A mechanic is not needed to replace the battery; with only a few tools you can replace it yourself.
Step 1
Engage the emergency brake and ensure the ignition is in the "Off" position.
Step 2
Open the hood of the Honda Civic and locate the battery on the back, left side of the engine compartment.
Step 3
Pull up on the protective cover of the negative battery cable, use the 10-mm wrench to loosen the wire bolt and lift the wire off of the negative terminal. The negative battery cable is often black. It is connected to the terminal with the "-" symbol.
Step 4
Lift the protective cover of the positive battery cable, loosen the wire with the 10-mm wrench and pull it off of the terminal. Positive battery cables are often red. The cable is connected to the battery terminal with the "+" symbol.
Step 5
Loosen the bolt on the bracket that secures the battery to the battery holder with the 10-mm wrench.
Warning
Always disconnect the negative battery cable first and connect it last when replacing the battery. This prevents damage to many electrical components in the vehicle if you accidentally touch a metal tool to the positive terminal and the car body at the same time.