Subaru Impreza Battery: Specs, Fitment & Common Faults

On the Impreza, the Data Communication Module has genuinely been documented as a confirmed cause of flat batteries after extended standing on related Subaru models.

Illustration for editorial purposes

OEM Part Number: 82110AA012

Genuinely useful to know: Subaru owners have found online CCA figures inconsistent across forums — checking your own battery's physical label, or contacting Subaru directly, is more reliable than trusting forum consensus.

Genuine reference (shared with BRZ, Crosstrek, Forester, STI, WRX)	Subaru OEM: 82110AA012 — 55D23L MF
2.0L CVT, per Subaru's own service manual	75D23L, 470A, 53Ah
Manual transmission, per Subaru's own service manual	55D23L, 390A, 40Ah

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 Useful Piece of Context Worth Knowing About Subaru's Connected Services — Subaru Impreza Battery

If your battery keeps going flat after the car has sat unused for around ten days or more, this is genuinely worth knowing: the Data Communication Module, responsible for connected services on related Subaru models, has been documented as a confirmed cause of exactly this pattern, still affecting cars as recent as the 2024 model year on some related models. It's worth asking a dealer directly and specifically about this component if you're facing a similar drain, rather than only being told to check for more generic parasitic drains.

Worth knowing that UK-spec Subarus have a UK-fitted perimetric alarm system as standard, distinct from the base specification the car might have in other markets — worth considering as a possible contributor if you're chasing an unusual drain.

It's also genuinely worth knowing that a dealer dismissing a recurring battery issue as simply "not driving the car enough" doesn't necessarily rule out a genuine fault, particularly if your usage pattern hasn't meaningfully changed from a previous car that never had the same problem.

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 Subaru Battery

The same part, covered across other Subaru models.

Subaru Impreza Battery: Specs, Fitment & Common Faults

OEM Part Number: 82110AA012

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A Genuinely Useful Piece of Context Worth Knowing About Subaru's Connected Services — Subaru Impreza Battery