BMW 1 Series Battery: Specs, Fitment & Common Faults

On the 1 Series, a new battery genuinely needs to be registered with the car's computer, and coded first if the type or capacity differs — plus an honest account of a fitter claiming registration was done when it genuinely wasn't.

Generation covered: this guide is for the third-generation 1 Series (F40, 2019–present), with particular focus on 2019–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

OEM Part Number: 61216806755

Accuracy note: BMW fits several genuine AGM battery capacities across 1 Series generations (E81/E87/E82/E88/F20/F21) 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 E81-F21 and later chassis)	BMW OEM: 61216806755
80Ah AGM (M135i 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.

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. If the replacement differs in type or capacity from the original, such as switching to an AGM battery, it will also need to be coded first, before being registered. Failing to do this properly can affect the car's charging behaviour, since the system won't apply the correct charging parameters for a battery type it doesn't recognise.

A genuinely honest, real account worth knowing: one documented case involved a fitter claiming a battery registration had been completed when it genuinely hadn't — worth verifying this yourself afterward using a diagnostic app rather than taking a fitter's word for it. Dealer registration alone has been quoted at around £200 in some cases, though genuinely cheaper independent coding services exist.

It's also genuinely worth knowing that not every car of this model necessarily has this battery management system, worth checking the negative battery terminal directly for a small sensor module clipped to the cable to confirm whether registration is genuinely needed at all.

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 BMW Battery

The same part, covered across other BMW models.