BMW 4 Series Battery: Specs, Fitment & Common Faults

On the 4 Series, a new battery genuinely needs to be registered with the car's computer, and coded first if the type or capacity differs.

Illustration for editorial purposes

OEM Part Number: 61216806755

Accuracy note: BMW fits several genuine AGM battery capacities across 4 Series generations depending on engine and equipment level — always confirm the Ah rating printed on your existing battery before ordering, since fitting the wrong capacity means the car's charging system needs reprogramming (coding) regardless.

92Ah AGM (shared across the wider 1/2/3/4/5 Series range)	BMW OEM: 61216806755
80Ah AGM (M3/M4 and similar performance trims)	BMW OEM: 61217555719
Note	Genuine BMW batteries use black casing for AGM and white casing for standard lead-acid — check which type is currently fitted before assuming, and have any replacement registered (coded) to the car's charging system regardless of brand.

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.

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.

Fitment & Compatibility

Battery type and capacity differ between standard and stop-start equipped versions of the 4 Series, and fitting a standard battery to a stop-start car can cause premature failure since it's not designed for the frequent cycling involved. Always confirm the exact battery type and capacity for your specific trim before ordering. Whether you're sourcing a replacement battery for your BMW 4 Series from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

A Genuinely Important, BMW-Specific Finding Worth Knowing

This is genuinely important to know before replacing this battery: if your car is fitted with an intelligent battery sensor, a new battery genuinely needs to be registered with the car's computer afterward, and coded first if it differs in type or capacity from the original.

A genuinely honest, real account worth knowing: a fitter has been documented claiming a battery registration had been completed when it genuinely hadn't, worth verifying this yourself afterward using a diagnostic app.

It's also genuinely worth knowing that not every car of this model necessarily has this system fitted, worth checking the negative battery terminal directly for a small sensor module clipped to the cable.

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, the registration step many modern cars need, and matching the right technology (standard, EFB, AGM) when buying aftermarket.

More BMW Battery

The same part, covered across other BMW models.