Disconnect and Reconnect the Battery

Last updated: June 8, 2026

Disconnecting the 12 V battery on your Alfa Romeo Brera (2005–2011) — for a new battery, winter storage, or work near the airbags — is a straightforward job. The battery sits under the bonnet, in the engine bay.

Find the Battery First

The 12 V battery is in the engine compartment, in the usual front corner under a cover. Note your radio security code and presets before you start.

Disconnecting Safely

1. Switch everything off and remove the key.
2. Disconnect the negative (−) terminal first, then the positive.
3. Working near airbags or seat-belt pretensioners? Wait a few minutes after disconnecting before such work.

Reconnecting and Re-initialising

Reconnect positive first, then negative. The Brera then relearns:

• Power windows — one-touch usually needs re-initialising (see our Brera window-reset guide).
• Electric sunroof (if fitted) relearns its travel.
• Steering-angle settles after a short drive; re-enter the clock and presets.

If Something Isn’t Right Afterwards

• Warning lights often clear after a short drive once the relearns complete.
• A persistent light stores a code — look it up on autodtcs.com.
• Fit a like-for-like battery of the correct capacity.

Frequently Asked Questions

Where is the battery on an Alfa Romeo Brera?

In the engine compartment, in the usual front corner under a cover.

Which terminal first?

Negative (−) off first, reconnect it last.

Do I need to recode anything?

Windows and sunroof may need a one-touch relearn, and you’ll re-enter the clock and presets.

How long should I wait near the airbags?

Give it a few minutes after disconnecting before working on airbags or pretensioners.

If the windows lost one-touch, see our Brera power-window reset guide.