Battery

Summary

Source: owner's manual / last verified 2026-10-16 (2019 Mazda CX-5 Owner's Manual, form 8HH4-EA-19A, June 2022 Print 3, battery specification and maintenance (opens in a new tab)).

Safety

• Keep flames and sparks away from open battery cells. Hydrogen gas can explode.
• Do not let a tool bridge the positive terminal to the body.
• Remove the battery cover before maintenance, and reinstall it.
• The under-hood replacement is a dealer purchase. The book does not print cable-removal steps.
• The key battery can leak if it is installed backwards. Do not throw it in a fire.

Symptoms

• The car will sit for a long time. The book says to disconnect the cables and charge the battery every six weeks.
• The transmitter buttons do nothing and the operation indicator does not flash.

Diagnosis

1. Gasoline and diesel classifications overlap at 12V-65Ah/20HR and then diverge. Read the engine row.
2. A dead key is CR2025. The KEY indicator flashing for about 30 seconds after shutdown is one of the low key-battery signs.

Tools

• Flathead screwdriver

  The key-battery procedure uses a tape-wrapped flathead screwdriver. It is not the tool for the under-hood battery.

Specifications

Steps

1. 01Keep the installed battery clean

   Remove the cover first. Keep the battery mounted, the top clean and dry, and the terminals clean, tight, and coated with petroleum jelly or terminal grease. Rinse spilled electrolyte with water and baking soda.

2. 02Buy the under-hood battery from a dealer

   The replacement section says to contact an Authorized Mazda Dealer. Use the gasoline or diesel classification from the specifications table.

3. 03Replace the key battery separately

   If the buttons fail and the indicator does not flash, the transmitter battery may be dead. The book prefers a dealer and also prints the CR2025 steps, positive pole up.

Common mistakes

• Buying the diesel 80Ah classification for a gasoline car.
• Installing the CR2025 upside down.
• Treating the key procedure as the under-hood battery procedure.

Parts and tools

Outbound links only. BaySheet does not sell parts. Confirm fitment on the retailer page. Amazon links are searches for a real part name plus this vehicle. Tool rows do not get a product search. The search is not a part number.

• Part

  12V-60Ah/20HR or 12V-65Ah/20HR battery

  The gasoline SKYACTIV-G classification. The book does not print a brand part number.

  2019 CX-5 battery specification (opens in a new tab)Search Amazon.com (affiliate link) (opens in a new tab)As an Amazon Associate I earn from qualifying purchases.

• Part

  CR2025 battery

  Transmitter battery. Positive pole faces up. Not the vehicle battery.

  2019 CX-5 key battery (opens in a new tab)Search Amazon.com (affiliate link) (opens in a new tab)As an Amazon Associate I earn from qualifying purchases.

• Tool

  Flathead screwdriver

  The key-battery procedure uses a tape-wrapped flathead screwdriver. It is not the tool for the under-hood battery.

  McMaster-Carr screwdrivers (opens in a new tab)

Questions

Sources

• 2019 Mazda CX-5 Owner's Manual, form 8HH4-EA-19A, June 2022 Print 3, battery specification and maintenance (opens in a new tab). Mazda Motor Corporation. Published 2022-06-01. Read 2026-10-16.

Checklist and email notes

The maintenance checklist is on the site now. The email list is not sending yet, so this box will not store an address.

Other repairs on this 2019 CX-5

All Mazda CX-5 repairs

This repair on other vehicles

These guides cover the same kind of work. Their numbers belong to those vehicles, not to this one.