Renault Kadjar Battery: Specs, Fitment & Common Faults

On the Kadjar, a genuinely surprising real root cause: a faulty immobiliser control unit caused a drain that stumped two dealers for three weeks.

Illustration for editorial purposes

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Renault Kadjar Battery: OEM Part Number

Accuracy note: genuinely consistent case size (278mm) across the entire petrol and diesel range — capacity and technology vary by Start/Stop equipment rather than engine size.

Standard fitment, all engines	275-278mm length, 174-175mm width, 189-190mm height
Non-Start/Stop variants	70-75Ah, lead-acid, 680A (EN)
1.7 Blue dCi 4WD, Start/Stop	AGM technology, 70Ah, 760A (EN) — a standard lead-acid battery isn't sufficient for the frequent cycling involved

A Genuinely Surprising, Real Root Cause Worth Knowing About — Renault Kadjar Battery

If you've had two dealers and an auto-electrician all fail to find a persistent battery drain, this is genuinely worth knowing: one documented case, after three weeks of unsuccessful diagnosis, was eventually traced to a faulty immobiliser control unit itself — replacing it resolved the drain completely, with no reoccurrence six months later. This is a genuinely surprising root cause, and it's worth mentioning specifically as a possibility if you've already exhausted the usual suspects (interior lights, glovebox, boot light) without success.

A genuinely simple, free trick worth trying: some owners report a persistent drain stopping entirely after specifically deadlocking the car — pressing the lock button twice on the key fob, rather than just once — with no clear technical explanation for why, but consistent enough across reports to be worth trying before anything else.

It's also worth checking the glovebox door itself, not just the bulb: the plastic door can genuinely warp slightly over time, meaning the side that operates the internal switch retreats away from the switch plunger, leaving the light triggered even when the glovebox looks closed. If you've already removed the bulb and the drain persists, checking the door's fit and alignment against the switch is worth doing.

Renault Kadjar Battery: The Part Everyone Blames First, Not Always Correctly

When a Renault Kadjar won't start, the battery is the first suspect more often than anything else, and it's right often enough that checking it first is a reasonable move. It isn't always the actual cause though, which is worth knowing before paying for a replacement that solves 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.

Renault Kadjar Battery: What It Does

Starting the engine and running electrical systems whenever the engine isn't turning — that's the Renault Kadjar's 12V battery job. If it has stop-start, it works much harder than older designs, since the engine cuts out and restarts constantly, which is exactly why it needs a specific AGM or EFB battery rather than a standard one.

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Renault Kadjar 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 Renault Battery

The same part, covered across other Renault models.