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Mazda Mazda6 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the engine bay of a 3rd generation 2014 to 2018 Mazda 6 sedan.

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2016 Mazda 6 Engine Bay
Loosen Counterclockwise
Pull Off Negative Terminal
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2014, 2015, 2016, 2017 and 2018) Mazda Mazda6 sedan in changing a dead 12 volt automotive battery in the engine bay.

Owners of other Mazda vehicles such as the Mazda2, Mazda3, Mazda5, CX-3, CX-5, CX-7, CX-9, and the MX-5 Miata may also find these DIY instructions to be helpful.

The OEM battery was a "Group Size" 35 and part number Panasonic 55D23L MF or 55D23L-MF.

A few compatible replacement 12V car batteries with their part numbers are as follows: Bosch S6523B S6, Optima 8040-218 D35 YellowTop and Optima 8020-164 35 RedTop.

The tools needed to complete this procedure include a 10mm socket with a 1/4" drive ratchet and a 10mm wrench (or a deep well 10mm socket).

Cover & Tuck Away
Loosen Hold Down Bar
Loosen Counterclockwise
The first two steps are to open the hood and then move to the right side of the engine bay.

The 12V car battery is located on the driver side to the left of the fuse box and behind the engine air filter housing.

Loosen the nut on the "-" negative terminal by turning it counterclockwise with a 10mm socket and a 1/4" drive ratchet.

Pull the negative terminal straight off the "-" battery post.

Cover the terminal with a small towel and tuck it away on the side of the battery to help prevent accidental electrical contact.

Loosen the two nuts on the battery clamp or "hold down" bar by turning them counterclockwise with a 10mm wrench or a deep well 10mm socket with a 1/4" drive ratchet.

Pull Hook Off Bracket
Lift Off Battery Clamp
Flip Open Plastic Cover
Swing the two "J" hooks at the end of the battery hold down clamp bars off their mounting brackets on the sides of the battery tray.

Lift the hold down bar and the two "J" hook bars off the old battery while avoiding making contact with the posts or terminals.

Flip open the plastic cover on the "+" positive battery terminal.

Loosen Positive Terminal
Pull "+" Terminal Off Post
Tuck Away On Side
Loosen the 10mm nut on the "+" positive terminal by turning it counterclockwise.

Lift the positive terminal off the "+" battery post, flip closed the plastic cover and tuck it away on the side of the battery.

Lift Off Battery Heat Shield
Battery Box Removed
Lift Out Old Battery
Pull the battery cover (A.K.A. "heat shield" or "box") off the old battery and set it aside in a safe place.

Carefully lift the old battery straight out of the engine bay and gently rest it on the ground.

Try to avoid dropping or tipping over the old battery to prevent from having acid leak out.

Be sure to take the old battery with you to Walmart or the auto parts store to prevent from having to pay a "core", "disposal" or "recycling" charge. The retailer will also have the old battery properly recycled.

If you can wait a few days for delivery, I recommend buying the Bosch S6523B S6 12V battery since it has excellent reviews on Amazon.


Clean Off Battery Tray
Lower In Battery & Cover
Push On Positive Terminal
Clean off any debris from the plastic battery tray so that the new battery will rest evenly on it.

Carefully lower the new 12V battery in to the engine bay and on to the plastic tray.

The negative "-" battery post should be at the rear of the engine bay near the windshield.

The positive "+" battery post should be closer to the front of the engine bay closer to the fuse box and the engine air box.

Lower the heat shield box over the new battery.

If you've had a problem with corrosion (blue or white powder) building up on the terminals or battery posts, consider installing some felt anti-corrosion washers over the posts.

Push the positive terminal on to the "+" post.

Tighten 10mm Clockwise
Flip Closed Plastic Cover
Lower Hold Down Bar
Tighten the 10mm positive terminal nut in the clockwise direction until it is snug.

Try to avoid over tightening the terminal nut to prevent from cracking the battery post which could lead to an acid leak.

Swing the plastic cover closed over the positive terminal and battery post.

Re-Attach "J" Hook Bars
Tighten Right Side Nut
Tighten Left Side Nut
Carefully lower the hold down clamp and the two "J" hook bars over the new battery while avoiding making contact with the terminals or posts.

Re-attach the "J" hooks to their mounting brackets on the sides of the battery tray.

Tighten the two battery clamp nuts in the clockwise direction with the 10mm wrench until they are snug.

Make sure that the new battery can not be moved, slid, wiggled or rocked on the tray.

If the new battery can be moved, tighten the two 10mm nuts on the hold down bar an extra turn or two.

Push On Negative Terminal
Tighten 10mm Clockwise
12V Battery Replaced
Push the negative terminal on to the "-" battery post.

Tighten the 10mm nut in the clockwise direction until it is snug.

To test the new 12V car battery, start the engine, turn on the headlights and flash the high beams.

Please remember to adjust the time on the clock and program your favorite radio station presets before you start driving.

Don't forget to record the battery change in your vehicle's service records.

For more, check out my other 2014-2018 Mazda Mazda6 DIY Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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