Citroen C5 Aircross Battery: Specs, Fitment & Common Faults

On the C5 Aircross, if stop-start keeps failing despite a healthy battery, a real owner's blunt verdict on the AGM battery is worth knowing — plus a genuine, distinct drain cause.

Illustration for editorial purposes

OEM Part Number: 600-640A

Genuinely worth knowing: an owner on a dedicated C5 Aircross forum directly reported that "upgrading" from EFB to AGM actually performed worse for occasional-use driving, with faster self-discharge in cold weather than the standard EFB — the common "AGM is always better" advice doesn't universally hold for this specific model, so weigh your actual usage pattern before paying more for AGM.

Standard Start/Stop fitment	EFB technology, 60-65Ah, 600-640A (EN)
1.6 Hybrid PHEV, 12V auxiliary battery	13Ah, AGM/EFB, genuinely separate from the main starter battery and the high-voltage hybrid pack
Important	Any technology change (EFB to AGM or vice versa) may need the charging system reprogrammed to avoid Start/Stop or accessory faults — factor this into cost before switching.

A Genuine, Real Owner Complaint Worth Knowing About — Citroen C5 Aircross Battery

If your stop-start has stopped working reliably despite a relatively new battery, this is worth knowing directly: one documented owner's blunt assessment, after extensive troubleshooting with their dealer, was that the AGM battery fitted to these cars is "not fit for purpose" — needing a full charge on a proper smart AGM charger roughly every two to three weeks just to keep stop-start functioning during a pattern of shorter, everyday trips, despite the battery otherwise starting the car normally. If you're finding yourself charging the battery repeatedly just to restore stop-start rather than experiencing a genuine one-off fault, you're likely not alone, and it's worth raising this directly with Citroen rather than assuming your specific battery is simply defective.

A genuine, distinct root cause worth checking if the battery keeps draining overnight: a faulty fuse box has been documented as the actual cause of repeated flat batteries on more than one occasion, with lights, wipers, and the fan randomly activating and draining the battery even with the car locked and untouched. A replacement fuse box, sourced independently for under £100, resolved this completely in documented cases — worth considering if you've already replaced the battery more than once without a lasting fix.

A genuinely useful benchmark worth knowing: a healthy car at rest should draw well under 50 milliamps from the battery. If a multimeter test shows anywhere close to double or triple that figure, that's a genuine parasitic drain worth chasing down circuit by circuit rather than simply replacing the battery again.

The Part Everyone Blames First, Not Always Correctly

A car that won't start gets blamed on the battery more often than any other component, and it's right often enough to make that assumption a reasonable first check. But it's not always the actual cause, which is worth knowing before spending money on a replacement that doesn't fix anything.

Citroen C5 Aircross Battery reference plate

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.

What It Does

The 12V battery provides the power needed to start the engine and runs electrical systems when the engine isn't turning. On cars with stop-start technology, the battery works much harder than on older designs, since the engine switches off and restarts far more frequently — which is exactly why these cars need a specific AGM or EFB battery type rather than a standard unit.

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 Citroen Battery

The same part, covered across other Citroen models.

Citroen C5 Aircross Battery: Specs, Fitment & Common Faults

OEM Part Number: 600-640A

A Genuine, Real Owner Complaint Worth Knowing About — Citroen C5 Aircross Battery

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