12V battery & fitmentMazda Axela BM5FS

Mazda Axela BM5FS i-stop Battery: Q-85 Compatibility Checks

Identify the Q-85 stop-start battery in Mazda's documented BM5FS SKYACTIV-G 1.5 scope. Check chassis range, replacement compatibility and the required post-change i-stop confirmation.

Time
10 minutes to check a listing
Difficulty
Easy
Tools
2 needed
Instructions
5 steps

Applies to Mazda Axela BM5FS · Japan-market July 2016–August 2017 manual group; BM5FS-400001 onward. Japan-market BM5FS SKYACTIV-G 1.5 within Mazda's July 2016–August 2017 group, BM5FS-400001 onward. Always compare the described parts, labels and specifications with your own vehicle and manual.

Manual-referencedMazda Axela electronic owner manual: battery specificationsVehicle specifications > Electrical parts/bulbs > Battery; SKYACTIV-G 1.5 Q-85 row and footnote 1
Review evidence and limitations ↓

Parts & fitment · manufacturer evidence

BM5FS Q-85 evidence by manual group

Two independently checked Mazda editions list Q-85 for SKYACTIV-G 1.5. That strengthens the documented production coverage without turning Q-85 into a genuine Mazda order code or approving a seller's claimed equivalent.

Documented period: Mazda index: November 2013–July 2015, BM5FS-100001 onward; and July 2016–August 2017, BM5FS-400001 onward. Each starting serial belongs to its stated manual group, not an unlimited range. The intervening August 2015–June 2016 group is separate.

Buyer context: New Zealand / Kenya. The evidence remains Japan-market application data; destination-country stock and local factory fitment are not established.

BM5FS · product identity, evidence status and buyer decision
Identifier / proposalEvidence status and scopeBefore purchase
Early group: Q-85, SKYACTIV-G 1.5Manufacturer-listed application

February 2015 PDF, printed page 511, lists Q-85 for gasoline 1.5/2.0 and separately T-110 for diesel 2.2; Mazda's index associates this PDF with the November 2013–July 2015 group.

Match the full BM5FS serial and manual group. Do not select the neighbouring diesel battery as an upgrade.
July 2016–August 2017 group: Q-85Manufacturer-listed application

The index's BM5FS-400001 onward group links the electronic manual's SKYACTIV-G 1.5 Q-85 row and stop-start footnote.

Ask the supplier to confirm the proposed exact product's i-stop suitability, dimensions, terminals and hold-down against the car.
August 2015–June 2016 group / aftermarket equivalent / current OEM codeNot established here

The index separately lists BM5FS-300001 onward for the intervening group. Its battery page has not been independently established by this selection table; no current Mazda ordering number or alternate brand model is verified.

Open the matching Mazda manual and obtain written exact-product compatibility before purchasing. Two matching editions do not prove every intervening or later vehicle.
  • Q-85 is the documented stop-start battery type, not a Mazda genuine stock number. A generic 12V listing or larger advertised performance figure does not establish compatibility.
  • Mazda's later i-stop notes require a function check after battery replacement and direct owners to a dealer. Include that check in the installation quotation; no reset recipe or immediate-operation promise is supplied here.
  • For a New Zealand or Kenya purchase, ask for the exact replacement code, written chassis/equipment approval, included checks, warranty, return policy and delivery quote. Shipping a battery must be agreed with the supplier rather than assumed from an overseas parts catalog.
  • An existing battery label is useful evidence to investigate, not proof that a previous replacement was correct. Resolve conflicts with the production record before paying.

Fitment sources and application rows

BM5FS fuse and socket evidence for New Zealand → · BM5FS vehicle and battery evidence → · Advanced Key CR2025 is a separate battery →

Identify before you buy

A Q-85 listing is the start of the compatibility check

Mazda Axela BM5FS · manufacturer scope and owner decision
What you haveDecisionEvidence to obtain
BM5FS-400001 onward in the cited period; SKYACTIV-G 1.5Use the cited Q-85 stop-start rowMatch the actual vehicle and manufacturer's manual group.
Earlier BM5FS or uncertain production recordUse the separate production-group buying table aboveThe early PDF is independently checked there; unresolved groups still require their matching Mazda manual.
Alternative brand or claimed equivalentCompatibility remains unconfirmed hereWritten exact-vehicle approval, stop-start suitability, dimensions and terminal/hold-down match.
Installation quoteInclude post-change i-stop confirmationAsk who performs the check and whether it is included in the total.

Selection aid only. An unknown or conflicting configuration needs confirmation before purchase.

Have these references ready

  • Full chassis serial and production period
  • Battery label and written supplier compatibility statement

Step-by-step instructions

Choose the correct manufacturer-backed specification

Use these source-backed checks to identify the option for your exact equipment. This is a selection guide, not a hands-on replacement procedure. If a component or label looks different on your car, stop and check your own manual.

  1. Step 1 of 5

    Match the manual to the complete chassis range

    Mazda's manual index places BM5FS-400001 onward in the July 2016–August 2017 release group linked to the BN electronic manual. Earlier BM5FS groups have separate manuals. The BN address does not itself mean that BM5FS is excluded; the manufacturer's chassis list determines this documented scope.

    All steps ↑
  2. Step 2 of 5

    Choose the gasoline 1.5 row

    The linked Mazda battery table gives Q-85 for SKYACTIV-G 1.5. S-95 and T-110 in neighbouring rows are diesel references, not optional upgrades for BM5FS. Mazda identifies these as stop-start battery types needed for correct i-stop operation and recommends Mazda genuine batteries.

    All steps ↑
  3. Step 3 of 5

    Ask the supplier to prove the proposed substitute

    Use Q-85 as the documented requirement, then request written confirmation for the exact chassis, period and i-stop equipment. Check the proposed battery's stop-start suitability, physical dimensions, hold-down arrangement and terminal layout. A matching footprint, generic 12V description or seller's higher-number claim alone does not establish compatibility.

    Check before moving on

    The supplier confirms the exact replacement product against your vehicle and the Mazda requirement; no cross-reference is assumed here.

    All steps ↑
  4. Step 4 of 5

    Include the post-change check in the service scope

    Mazda's i-stop notes say its function must be checked when the battery is changed and direct owners to a Mazda dealer. Ask the installer whether that check is included. This resource gives no generic reset sequence, coding steps or promise that i-stop will operate immediately.

    All steps ↑
  5. Step 5 of 5

    Resolve an i-stop complaint before buying on symptoms alone

    Write down the warning or operating behaviour and ask for the diagnosis behind a replacement recommendation. An i-stop complaint alone does not establish a failed battery. If the listing, existing label or vehicle equipment conflicts with the manual, pause the purchase and resolve the discrepancy with Mazda or a qualified supplier.

    All steps ↑

References & limitations

Where these instructions come from

Japan-market BM5FS SKYACTIV-G 1.5 within Mazda's July 2016–August 2017 group, BM5FS-400001 onward

The manufacturer manual index establishes the chassis scope. No aftermarket model, Ah/CCA figure or equivalent battery code is approved by this article; earlier manuals must be checked separately.

Mazda Axela electronic owner manual: battery specifications ↗

Manual section: Vehicle specifications > Electrical parts/bulbs > Battery; SKYACTIV-G 1.5 Q-85 row and footnote 1

Instructions checked against manufacturer documentation; not a physical inspection of every vehicle.