Mazda CX-3 Battery: Specs, Fitment & Common Faults

On the CX-3, leaving the car unlocked, even in your own garage, can genuinely drain the battery faster than keeping it locked.

Illustration for editorial purposes

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OEM Part Number: 0000-80-0035-WB

Genuinely worth knowing: a CX-3 Forum member with a Japan-built 2016 CX-3 found their battery label written entirely in Japanese, making the type unreadable at a glance — Group Size 35 (JIS D23) was confirmed by checking their VIN against Interstate/Batteries Plus lookup tools rather than relying on the physical label.

Genuine reference, all CX-3 (2016 onwards)	Mazda OEM: 0000-80-0035-WB — JIS D23 (75D23L), Japan-built, without i-ELOOP
Standard fitment, dimensions	BCI Group 35, 60-65Ah, 550-650A depending on technology (flooded, EFB, or AGM)
Important	If your battery's label is unreadable (common on Japan-built imports), your VIN is a more reliable way to confirm the exact spec than trying to translate the label.

A Genuinely Distinctive, Real Behavioural Finding Worth Knowing — Mazda CX-3 Battery

Multiple documented cases on related Mazda models point to the car needing to be genuinely, fully locked to avoid faster-than-normal battery drain — even when parked inside your own garage. The suspected cause is the car continuously searching for and pinging a key fob left nearby while unlocked, which draws more power than when properly locked.

Worth knowing about a confirmed Mazda Special Service Program affecting related models: Mazda has officially acknowledged a Remote Tuner Module software fault on several 2023 models that can drain the battery if the car sits unused — worth asking a dealer whether this applies to your specific car and build date.

It's also worth knowing a genuinely useful technical benchmark: normal parasitic drain on a healthy Mazda while parked has been documented and calculated at around 55 milliamps, meaning a healthy battery should reasonably last around a month to six weeks before needing a recharge.

Mazda CX-3 Battery: The Part Everyone Blames First, Not Always Correctly

Ask anyone why their Mazda CX-3 won't start and "the battery" is usually the first guess, and it's frequently correct, which makes it a reasonable starting point. It's not always right, though, so it's worth ruling out other causes before spending on a replacement that changes nothing.

Before you buy: battery size, capacity and type (standard vs AGM/EFB for stop-start systems) vary by trim and engine. Always confirm against your VIN before ordering.

Mazda CX-3 Battery: What It Does

On the Mazda CX-3, powering the engine start and running electrics while the engine's stopped both fall to the 12V battery. Stop-start technology puts significantly more strain on it than older designs, thanks to how frequently the engine cycles — explaining why a specific AGM or EFB battery is needed rather than a standard unit.

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Mazda CX-3 Battery: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Battery Guide for warning signs to watch for, confirming fitment against your VIN, and matching the right technology (standard, EFB, AGM) when buying aftermarket.

More Mazda Battery

The same part, covered across other Mazda models.