Parts for your 2019 Subaru Impreza-Batteries

2019 Subaru Impreza batteries: purpose, maintenance and replacement

Based on the 2019 Subaru Impreza Owner’s Manual (Electrical System—Battery), Subaru service literature, and Subaru Genuine Parts catalogues, the 2019 Subaru Impreza is fitted with a 12‑volt starting battery. Many AU/NZ trims also include Auto Stop‑Start, which specifies an enhanced battery type (EFB or AGM) for durability.

The battery’s job is straightforward but vital: it cranks the FB20 engine, powers lights and electronics under the bonnet and in the cabin, and stabilises voltage for the vehicle’s ECUs, safety systems, and infotainment. On models with Auto Stop‑Start, the battery also handles frequent restarts and deeper cycling, so it’s built tougher than a conventional flooded unit.

For servicing, a healthy battery keeps the Impreza starting cleanly and avoids odd electrical gremlins. Owners can expect around 3–5 years from a quality battery in typical Australian and New Zealand conditions, vehicles with Auto Stop‑Start or lots of short trips may see shorter life. As per Subaru service guidance, routine checks should include open‑circuit voltage, state of charge, terminal condition, and a conductance/CCA test.

• Match the spec: if the car has Auto Stop‑Start, replace like‑for‑like with EFB or AGM. Don’t downgrade to a standard flooded battery.
• Size and ratings: fit the correct case size and terminals, and meet or exceed the original CCA and reserve capacity listed in the owner’s manual or under‑bonnet label (many 2.0‑litre Imprezas fall in the ~500–650 A CCA range).
• Charging: use a smart charger compatible with EFB/AGM when topping up off‑car. Avoid deep discharges.
• Terminals: clean and tighten the clamps and hold‑down. Light corrosion protection helps.
• Sitting for weeks? A quality maintainer prevents sulfation and nuisance flat batteries.

During replacement, a memory saver can preserve radio presets and settings, though the Impreza typically doesn’t use a security code. After reconnection, some features (clock, one‑touch windows, and Auto Stop‑Start logic) may need a short relearn: a few minutes of mixed driving lets control modules settle. Dispose of the old unit via a proper recycling stream—lead‑acid batteries are hazardous but highly recyclable.

Following the owner’s manual and Subaru technical guidance keeps the electrical system happy and ensures reliable starts, smooth Stop‑Start operation, and fewer surprises on busy mornings.

Popular questions about 2019 Subaru Impreza batteries

What battery type and size fits a 2019 Subaru Impreza?
Subaru specifies a 12‑volt battery matched to the vehicle’s tray and terminals, with the correct cold‑cranking amps and reserve capacity. Many AU/NZ Imprezas with Auto Stop‑Start require an EFB or AGM unit designed for repeated cycling. The exact case size and rating are listed in the owner’s manual and on the original battery label.

How long should the battery last?
Typically 3–5 years in local climates, provided it’s driven regularly and kept charged. Cars that see lots of short, stop‑start trips or sit for long periods may shorten battery life. Annual testing during servicing is a good way to catch a weakening battery before it causes non‑starts.

Does the car need any resets after a battery change?
After reconnection, the clock and radio presets may need a quick tidy‑up. One‑touch windows can be re‑initialised with a full up/down cycle. Auto Stop‑Start behaviour can take a short drive to relearn, as charging state and control modules stabilise.