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Car Battery Replacement Steps
Choose, swap and dispose of a car battery in the right order, with the safety steps in between.
A real, editable checklist below — tick, tap a line to rewrite, drag to reorder.
Tick the circles, tap any line to change it, drag the dots to reorder.
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Changing a car battery is a job for someone with a few hand tools and a battery that's easy to reach. NAPA calls it relatively easy, but some batteries sit under a fender, under the rear seat or in the trunk, and VARTA says only about 58% are under the bonnet. If yours is tucked away, consider having a garage do it. VARTA also advises a professional garage for modern start-stop cars. This list covers the swap itself, the cable order and getting the old battery recycled. It doesn't cover jump-starting or working out why the battery died.
Why these items are on the list
- Confirm the battery is the problem. A faulty alternator, parasitic drain or wiring fault can flatten a new battery too.
- Find the right replacement battery. Check your manual for the right size and type. It also helps to know your battery's BCI number.
- Match cold-start current and capacity. Cold-start current matters in winter. Capacity matters more with lots of electronics.
- Gather spanner, socket wrench, cloth. The AA says you'll typically need 10mm or 13mm spanners, plus a cloth to cover the other terminal.
- Wear gloves and safety glasses. Protect your eyes and avoid contact with any battery acid that has escaped.
- Switch off, remove the key. Turn the engine off and take the key out before you start work on the battery.
- Note which terminal sits where. Positive has a plus sign and often red. Check before removing, to avoid reversing it.
- Consider an OBDII memory saver. Optional, though NAPA recommends one for late-model cars.
- Disconnect the negative cable first. That prevents a short between the positive terminal and the car body.
- Disconnect the positive cable. Move both cables clear so neither can touch a terminal.
- Undo the hold-down clamp. Most batteries are held by a tie-down or clamp across the casing.
- Lift the old battery out. Many batteries have built-in handles, so use them to lift it out carefully.
- Inspect the tray for corrosion. Corrosion nearby can mean leaked acid, which is a job for a workshop.
- Clean terminal clamps and tray. Baking soda and water works. Let everything dry before the new battery goes in.
- Seat the new battery. Check positive and negative are on the correct sides, then fit the hold-down.
- Connect positive first, then negative. Reverse of removal. Check polarity once more before you connect.
- Tighten the terminal clamps. Loose clamps cause contact breaks from vibration. VARTA says use a torque wrench and the manual's value.
- Start the car to test. Check the cables are secure on the posts, then close the bonnet firmly.
- Check for recalibration needs. Modern cars may need airbags, sensors and comfort functions recalibrated after a battery change.
- Recycle the old battery. It's hazardous waste, not household garbage. Workshops, recycling centers and parts stores take them.
Tick each step as you go, since the order is the part you don't want to guess at. A second person can read it out while you work.
When to use it
Use it when the car struggles to start and you've decided to swap the battery yourself.