Volkswagen Caddy Battery: Specs, Fitment & Common Faults

A genuine, well-documented VW Group requirement: the Caddy's replacement battery needs to be "coded" to the car's Gateway module — here's what that actually involves.

Illustration for editorial purposes

OEM Part Number: 5QS915089C

Genuinely useful to know: Caddy shares its platform with the Touran and parts of the Golf V — a CADDY2K.com forum member confirmed the genuine battery box components are shared with the Golf too, including trim and cover part numbers, if you're upgrading to a rigid battery box.

Genuine VW reference (Caddy 4, Type 1)	VW OEM: 5QS915089C
Caddy III (2K), 1.6/2.0 TDI diesel, standard fitment	242-243mm case, minimum 59Ah, lead-acid
Caddy III, Start/Stop variants	AGM technology, 70-72Ah, 720-760A (EN) — a standard lead-acid battery isn't sufficient for the frequent cycling involved
Genuine battery box components (shared with Golf)	Trim: 3C0-915-335, 3C0-915-336-A. Cover: 3C0-915-443-A

Confirmed: Most Caddys Genuinely Need the Battery "Coded" After Replacement — Volkswagen Caddy Battery

This is worth understanding before assuming a simple swap is the end of the job: VW Group vehicles with a Battery Management System (essentially any model with stop-start) need the new battery's details — capacity, chemistry, and serial number — registered to the car's Gateway module, a process usually called battery coding or registration. Skip this, and the car's charging strategy keeps assuming the old, worn battery is still fitted, which can lead to overcharging or undercharging the new one and shortening its life prematurely. This can genuinely be done with widely available aftermarket tools like VCDS or OBDeleven, not exclusively at a VW dealer with their ODIS system — worth knowing if you're comparing quotes or considering doing it yourself.

A genuinely useful, specific detail: the coding process reads a Part Number, Vendor Code, and Serial Number printed on the battery's own label — budget or generic aftermarket batteries sometimes lack a valid one of these, which can cause the coding process to fail outright. If a battery's exact new part number is rejected during coding, using the original (pre-supersession) part number instead sometimes resolves it. Genuinely worth choosing a battery from a reputable supplier with proper VAG-compatible labelling rather than the cheapest generic option specifically for this reason.

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.

Volkswagen Caddy 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 Volkswagen Battery

The same part, covered across other Volkswagen models.

Volkswagen Caddy Battery: Specs, Fitment & Common Faults

OEM Part Number: 5QS915089C

Confirmed: Most Caddys Genuinely Need the Battery "Coded" After Replacement — Volkswagen Caddy Battery

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