Most people can swap their own car battery in under 15 minutes with basic hand tools. Here's how to do it safely and correctly.
A car battery stores significant electrical energy. While a Salty Cells sodium-ion battery is inherently safer than lead-acid (no sulfuric acid, no hydrogen gas), basic electrical safety still applies:
Disconnecting your battery will reset in-car electronics including radio presets, clock, and trip computers. On some vehicles it may also reset window and sunroof positions. If your radio requires a code after power loss, locate this code in your owner's manual or contact your dealer before starting. A battery memory keeper (available from Repco, Supercheap Auto, Autobarn) can preserve these settings during the swap.
Park on level ground, engage the handbrake, and turn the ignition fully off. Remove the key from the ignition. For start-stop vehicles, ensure the system has completed its cycle (the engine should have fully stopped). Wait 2 minutes after shutting off before touching any terminals — this allows capacitors in the vehicle's electrical system to discharge.
In most Australian vehicles, the battery is under the bonnet, usually on the left or right side of the engine bay. Some modern vehicles (particularly European models like BMW, Audi, and Mercedes) place the battery in the boot or under the rear seat. Consult your owner's manual if you're unsure. Once located, identify the positive terminal (marked + or covered in red) and the negative terminal (marked − or covered in black).
Always negative first. Use your 10mm or 13mm spanner to loosen the bolt on the negative (black/−) terminal clamp. Once loose, wiggle the clamp off the post and move it well away from both terminals. Tuck it to the side so it cannot accidentally contact any metal surfaces. If the clamp is corroded, use a flat screwdriver to gently lever it off the post.
With the negative terminal safely out of the way, loosen and remove the positive (red/+) terminal clamp in the same way. Be careful that the positive cable does not contact any part of the vehicle chassis — this can cause a spark and blow a fuse, or in extreme cases, damage the vehicle's ECU. Move the positive cable aside.
Most batteries are secured by a hold-down clamp at the base or a bar across the top. Locate and remove this bracket using the appropriate spanner or socket. Keep the bolts somewhere safe — you'll need them to secure the new battery. Some vehicles use a J-bolt system at the bottom of the battery tray; others use a frame bracket across the top.
Lift the old battery straight out of its tray. Be prepared — a standard lead-acid battery weighs 15–25 kg, so use both hands and bend your knees. Take this moment to inspect the battery tray for any corrosion, cracks, or debris. Wipe the tray clean with a damp rag. If there is significant white or blue corrosion (dried sulfuric acid deposits), clean it carefully with a rag dampened with bicarbonate of soda solution (1 tablespoon per cup of water).
Lower the new battery into the tray, ensuring it sits flat and the terminals are on the correct side to reach the vehicle's cables. Your Salty Cells battery weighs significantly less than the battery you just removed — enjoy that. Reinstall the hold-down bracket and tighten it securely. The battery should not be able to move when pushed. Loose batteries are a safety hazard.
This is the reverse order from removal. Slide the positive (red/+) clamp onto the positive terminal post and tighten the bolt firmly — snug but not so tight that you risk stripping the thread. If you have terminal protector spray or felt washers, apply them now before connecting. Wiggle the clamp to confirm it's secure. A loose positive connection is a common cause of intermittent electrical faults.
Attach the negative (black/−) clamp to the negative post and tighten securely. At this point your vehicle is now electrically live, so be mindful of what you're touching. The clock on your dash should display, and any courtesy lights may come on — this is normal.
Start the vehicle as normal. It should start immediately and confidently. Listen for the alternator (the engine should settle into a normal idle within seconds). Check that your instrument cluster is displaying normally. Some vehicles may show a battery warning light briefly while the BMS recalibrates — this typically clears within a few minutes of driving. Re-enter any radio codes if required, and reset your clock.
That's it. Your Salty Cells battery is installed and your vehicle is ready to go. We recommend a short 20-minute drive (not just idling in the driveway) to allow the alternator to bring the battery to a full charge state. If you have any issues or questions after installation, contact us at contact@saltycells.com.au.
Lead-acid batteries contain lead and sulfuric acid — both hazardous materials. In Australia, it is illegal to dispose of them in general household waste or landfill. The good news: they're almost universally recyclable, and most retailers accept them for free.
Australia recycles over 95% of lead-acid batteries — one of the highest recycling rates of any product category. The lead is recovered and used to make new batteries, and the sulfuric acid is neutralised and converted into sodium sulfate for use in detergents and glass manufacturing.
Some European vehicles (particularly BMW, Mercedes-Benz, Audi, and Volkswagen from 2006 onwards) use a battery management system that requires the battery to be "registered" using a diagnostic tool after replacement. Without this step, the vehicle may charge the battery incorrectly or show erroneous warnings. If your vehicle requires battery registration, this is typically done at the dealership or by a workshop with a compatible scan tool (such as Launch, Autel, or ISTA for BMW). Salty Cells batteries are compatible with all standard registration protocols — just register the new battery using the "Wet/Flooded" or "Standard" battery type in your diagnostic software.
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