The main 12-volt starting battery in most Peugeot Boxer vans sits in the engine bay, on the side of the bay closest to the wheel arch. In models equipped with a Start-Stop system, there may be a second auxiliary battery located elsewhere to support electronics when the engine is off.
Where to look in the engine bay
Below are the typical placements you’ll encounter. Note that exact positions can vary by year, trim level, and whether a second battery is installed.
- Main 12V starting battery: usually mounted in a tray within the engine bay, near the front of the vehicle and toward the side closest to the wheel arch. It is often covered by a plastic cover and marked with a 12V label and positive/negative terminals.
- Auxiliary battery (if equipped for Start-Stop): commonly located under the front passenger seat or in a separate tray behind the engine bay area, depending on market and model year.
If you’re unsure exactly where yours is, check the owner’s manual for the exact diagram for your year and trim, or ask a Peugeot/Fiat professional. Visually, you’re looking for a rectangular box with heavy gauge cables connected to the terminals.
Accessing the battery safely
When you need to inspect or replace the battery, follow these steps to avoid injury or damage. These guidelines apply to the main battery in the engine bay and to any auxiliary battery installed for Start-Stop systems.
- Ensure the vehicle is parked on a flat surface with the engine off and keys removed from the ignition. Put on gloves and eye protection.
- Open the hood and locate the battery in the engine bay (or under the passenger seat if it’s the auxiliary battery).
- Disconnect the negative (-) terminal first, then the positive (+) terminal. This reduces the risk of short circuits.
- Remove or loosen any clamps or covers as required to access the battery terminals.
- Perform the needed maintenance (inspection, cleaning, replacement), then reconnect in reverse order: positive first, then negative.
Always follow safety precautions when working around batteries. If in doubt, have a qualified technician perform maintenance or replacement.
Model variations: single vs. dual battery systems
Single-battery configurations
Older or mid-range Boxer models without a Start-Stop system typically use a single 12V battery located in the engine bay, as described above. Access is straightforward through the engine compartment.
Dual-battery configurations (with Start-Stop)
More recent Boxer variants with Start-Stop and higher electrical demand may include a secondary (auxiliary) 12V battery. This second battery is often placed under the front passenger seat or in a separate tray near the engine bay, and it helps power electronics when the engine is off. Location can vary by year and market, so consult the owner’s manual for the exact site.
Bottom line
For most Peugeot Boxer vans, the main battery sits in the engine bay at the side near the wheel arch, with a potential secondary battery placed elsewhere if Start-Stop or enhanced electrical systems are fitted. If you’re locating or replacing a battery, verify the exact layout for your year and trim in the manual or with a dealer, and follow proper safety steps to disconnect and reconnect the terminals.
Summary
Most Boxer vans keep the main battery in the engine bay, near the wheel arch. Some models add an auxiliary battery for Start-Stop, often under the front passenger seat or in a dedicated tray. Always consult the owner’s manual for your exact year and variant, and practice safe disconnect/reconnect procedures when handling the battery.