Toyota RAV4 Battery: Specs, Fitment & Common Faults

On the RAV4 Hybrid, Toyota's own dealer test may not let the battery stabilise before checking it, potentially masking a genuine problem.

Illustration for editorial purposes

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OEM Part Number: 28800-AZC34

Accuracy note: every UK Mk5 RAV4 (2019 onwards) is hybrid or PHEV and uses a small, separate 12V AGM auxiliary battery, not the high-voltage hybrid drive battery — confirm which one you actually need before ordering, since they're very different components at very different price points.

Mk5 Hybrid/PHEV, 12V auxiliary (S46B24R)	Toyota OEM: 28800-AZC34 — 45Ah, AGM
Alternative reference, related generation (S55D23R)	Toyota OEM: 28800-28101 — 51Ah
2018-2022 RAV4 Hybrid (LN1 reference)	Toyota OEM: 28800-AZC13 — 52Ah
Pre-2019 petrol/diesel RAV4	Standard Group 096, 72Ah, approximately 640 CCA — not applicable to hybrid/PHEV models

A Genuinely Significant, Widespread Issue Worth Understanding on Hybrid Models — Toyota RAV4 Battery

If your hybrid's 12V battery keeps reading low despite a dealer telling you it "passed all checks," this is genuinely worth knowing: real, documented owner reports suggest Toyota's own dealer diagnostic test doesn't allow the battery sufficient time to stabilise after charging before testing it — meaning a genuinely weak battery can pass, only for the voltage to drop again within hours. It's worth understanding why hybrids are more prone to this: since the hybrid powertrain doesn't use the 12V battery for traditional engine cranking, manufacturers fit a considerably smaller-capacity battery, adequate for its job but with less margin for short journeys or extended standing.

Genuinely useful, official Toyota guidance worth following: if the car will be sitting unused for more than a few days, Toyota's own recommendation is to run it in "Ready" mode for around an hour a week. It's also genuinely important to avoid leaving the car in "Accessory" mode, since this can flatten the 12V battery within just a few minutes on some examples.

If the problem is genuinely persistent, it's worth pushing for a proper cell-level health check rather than accepting a simple charge-and-return: one documented case saw Toyota's own diagnostics find genuinely damaged cells, resolved with a warranty replacement using a higher-capacity unit, after which the problem stopped entirely.

Toyota RAV4 Battery: The Part Everyone Blames First, Not Always Correctly

On the Toyota RAV4, more non-starts get pinned on the battery than on any other single component, and that assumption is correct often enough to justify checking it first. It's not always the real cause, though, so it's worth confirming before spending money on a replacement that doesn't fix the problem.

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.

Toyota RAV4 Battery: What It Does

On the Toyota RAV4, every engine start and every moment the electrical systems run without the engine turning draws on the 12V battery. Stop-start puts far more demand on that battery than older designs, given how often the engine cycles off and on — hence the need for an AGM or EFB battery instead of a standard type.

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Toyota RAV4 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 Toyota Battery

The same part, covered across other Toyota models.