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Most common fit — Toyota Yaris: Genuine Toyota 28800-F3020 (LN0) — ~35Ah, LN0 case, Toyota OE part number. Genuine Toyota 28800-F3020 (LN0) — check price on Amazon
Fitment varies by engine and build date — other variants are listed below.
Battery Specifications
| Parameter | Specification |
|---|---|
| Battery Group | LN0 — Toyota part 28800-F3020, also catalogued 340LN0-MF |
| Type | 12V auxiliary battery — Toyota lists a maintenance-free (MF) type. Confirm AGM or flooded from the label on the battery you remove |
| Capacity | ~35Ah |
| Cold Cranking Amps | ~310 A (EN). Toyota does not publish a CCA figure for the OE part; the 340LN0 catalogue equivalent (Panasonic N-340LN0) is rated 35 Ah / 308 A |
| Dimensions | Approximately 175 x 175 x 190 mm (LN0 case). Measure the battery you remove before ordering |
| Terminal Type | Top post |
| Start-Stop Compatible | Not applicable — the UK Yaris Mk4 is a full hybrid and has no conventional stop-start starter |
Compact hybrid — standard 12V auxiliary
Recommended Batteries for Toyota Yaris
Genuine Toyota 28800-F3020 (LN0)
LN0 / ~35Ah 12V auxiliary battery
Yaris Mk4 12V battery — look up by registration
Frequently Asked Questions
What battery does a Toyota Yaris need?
The UK Toyota Yaris Mk4 is a full hybrid, and its 12V auxiliary battery is a small LN0-size unit of about 35Ah. Toyota lists it as part 28800-F3020 (OPTIFIT BATTERY LN0 / 35Ah), also catalogued as 340LN0-MF. It is not a Group 027 battery and it is not an EFB, because the car has no conventional stop-start starter motor. Confirm the exact part against your registration or VIN before buying.
Does the Toyota Yaris need an AGM or EFB battery?
Neither, on the UK Mk4. It is a full hybrid, so there is no belt or pinion stop-start system placing EFB-level cycling demand on the 12V battery. Toyota specifies a small LN0-size 12V auxiliary battery of about 35Ah, listed as a maintenance-free type. Check the label on the battery you remove to see whether yours is AGM or flooded, and replace like for like.
How long does a Toyota Yaris battery last?
Typically 4–6 years depending on driving patterns. Short urban journeys and cold winters reduce battery life.
Can I replace the Toyota Yaris battery myself?
Yes, but check where it is first. On the Yaris Mk4 the 12V battery sits under the rear seat, not in the engine bay – the terminal you can see under the bonnet is a remote jump-start point. Disconnect the negative terminal first, then the positive, and fit the new battery in reverse order.
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →