Disconnect and Reconnect the Battery

Last updated: June 12, 2026

Disconnecting the 12 V battery on your Infiniti Q50 (V37, 2013–2023) — for a new battery, winter storage, or work near the airbags — is a straightforward job once you know where the battery lives.

Find the Battery First

On petrol Q50s the 12 V battery is in the engine compartment. On the hybrid (Q50 Hybrid) the 12 V auxiliary battery is in the boot — and the orange high-voltage system must never be touched. Note your radio presets before you start.

Disconnecting Safely

1. Turn the ignition off and make sure all electrical consumers are off.
2. Disconnect the negative (−) terminal first, then the positive.
3. Working near airbags or seat-belt pretensioners? Wait a few minutes after disconnecting.

Reconnecting and Re-initialising

Reconnect positive first, then negative. The Q50 then needs a few items relearned:

• Power windows — re-initialise one-touch (see our window initialisation guide).
• Steering angle sensor — the ESP/steering light may need re-zeroing.
• Tyre pressure monitor — re-store the pressures from the menu.
• Re-enter the clock and presets.

If Something Isn’t Right Afterwards

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

Frequently Asked Questions

Where is the battery on an Infiniti Q50?

In the engine compartment on petrol cars; in the boot on the hybrid (which also has a separate high-voltage system).

Which terminal first?

Negative (−) off first, reconnect it last.

What needs resetting afterwards?

Power windows, the steering angle sensor and the tyre-pressure monitor may need re-initialising, plus the clock.

Is the hybrid different?

Yes — service only the 12 V battery in the boot; never touch the orange high-voltage cabling.

To relearn the windows, see our Q50 power-window guide. If a warning light stays on, decode it on autodtcs.com.