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Mazda CX-5 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the engine bay of a 1st generation 2012-2016 Mazda CX-5 SUV with photos.

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2013 CX-5 12V Battery
10mm Deep Well Socket
Loosen "-" Terminal Nut
This automotive maintenance tutorial was specifically written to assist owners of the first generation (2012, 2013, 2014, 2015 & the updated 2016 model year) Mazda CX-5 SUV in changing a dead 12V automotive battery in the engine bay.

Owners of other Mazda vehicles such as the Mazda 2, Mazda 3, Mazda 5, Mazda 6, CX-7, CX-9, and the MX-5 Miata may also find these DIY instructions to be helpful.

The OEM battery in this 2013 CX-5 was Panasonic part number 55D23L-MF or 55D23LMF.

A few other compatible replacement "Group Size 35" batteries with their part numbers are as follows: Bosch S6523B S6, Bosch 35-640B, NAPA BAT 8435, Duralast 35-AGM, Optima RED35 and Duracell SLI35.

The tools needed to replace the battery include a deep well 10mm socket, an extension bar and a 1/4" or 3/8" drive ratchet.

Disconnect Negative Terminal
Cover Terminal & Tuck Away
Loosen 10mm Nuts
Make sure that the ignition switch is set to the "Off" position and then pop open the hood.

First loosen the nut on the negative "-" terminal by turning it counterclockwise with the 10mm socket and ratcheting wrench.

Pull the negative terminal straight off the "-" battery post, wrap it in a towel or rag and tuck it away on the side of the battery.

Covering the battery terminal with a towel will help prevent accidental contact with the battery post.

Turn 10mm Counterclockwise
Unhook "J" Bars
Remove Battery Clamp
Then loosen the two 10mm nuts at the top of the battery hold down bar by turning them counterclockwise.

Once the two nuts have been loosened a few turns, you should be able to unhook the two "J" bars from their brackets.

Hold Down Bar Released
Open "+" Terminal Cover
Loosen 10mm "+" Nut
Carefully lift the clamp and "J" bars off the battery while trying to avoid contact with the battery posts.

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

Loosen the 10mm terminal nut by turning it counterclockwise.

Pull Off Positive Terminal
Cover With Towel & Tuck
Lift Off Battery Box
Once the terminal nut has been loosened a few turns, pull the positive terminal straight off the battery post.

Wrap the positive terminal in a small towel or rag and tuck it away on the side of the battery to help prevent accidental contact with the posts.

Pull the battery box (A.K.A. "heat shield") straight off the old battery and set it aside in a safe place.

Ready To Remove Battery
Pull Out Old Battery
Old 12V Battery Removed
Carefully lift the old battery straight out of the engine bay and gently set it on the ground.

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


Lower In New 12V Battery
Replace Battery Heat Shield
Battery Box Replaced
Clean off any debris from the battery tray so that the new battery will rest evenly on it.

Carefully lower the new battery in to the engine bay with the "-" negative terminal near the windshield and the "+" positive terminal closer to the front of the vehicle.

Push On Positive Terminal
Tighten 10mm "+" Terminal Nut
Push On "-" Terminal
If you've seen corrosion build up on your battery posts, consider installing some felt anti-corrosion washers.

They are very cheap insurance against having to replace your battery terminals.

First, push the positive terminal on to the "+" battery post.

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

Try to avoid over tightening the terminal nut to prevent from damaging the battery post.

Then push the negative terminal on to the "-" battery post.

Tighten 10mm Nut Clockwise
Lower Battery Clamp Bar
Attach "J" Hook Bars
Tighten the 10mm nut on the negative battery terminal by turning it in the clockwise direction until it is snug.

Carefully lower the battery hold down clamp and two "J" hook bars down over the new battery.

"J" Bar Attached To Bracket
Turn Nuts Clockwise
Hold Down Bar Re-Attached
Attach the hooks at the end of the "J" bars to the brackets on the sides of the battery tray.

Spin the nuts a few turns by hand in the clockwise direction to secure the "J" bars to the battery tray.

Tighten 10mm Nuts
Battery Clamp Secured
12V Battery Replaced
Tighten the two 10mm hold down bar nuts in the clockwise direction with the ratcheting wrench until the battery is securely held in place.

Double check that the new battery can not be wiggled or moved back and forth on the battery tray. If it can be moved, tighten the two 10mm nuts on the clamp a few more turns.

To test the new battery, start the engine and turn on the headlights.

Be sure to set the time on the clock and set your favorite radio station presets before driving the vehicle.

For more, check out all of my Mazda CX-5 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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