The short answer: in its electrified variants, the Transit Custom uses a high‑voltage battery for the hybrid or electric drivetrain alongside the traditional 12‑volt battery for normal vehicle systems. Non‑electrified versions still rely on a single 12‑volt battery. This separation supports electric drive, energy recovery, and reliable operation of starting and accessories.
Two battery systems explained
In electrified variants, Ford separates propulsion energy from standard vehicle electricals. For clarity, this section outlines the roles of the two batteries you’ll encounter.
- High‑voltage traction battery: powers the electric drive in hybrid configurations and stores energy captured during braking. It is recharged through plug‑in charging (in plug‑in hybrids) or by the engine and regenerative braking during operation.
- 12‑volt battery: supplies engine starting, lighting, instrumentation, infotainment, and other standard electrical loads. It remains the backbone for non‑propulsion electronics and is kept charged by the vehicle’s charging/regeneration system.
Understanding these two batteries helps explain the van’s behavior across different configurations, such as why electric modes are available in hybrids while the traditional 12‑volt system remains essential for everyday operation.
Electrified variants in the Transit Custom
The Transit Custom’s electrified lineup centers on two approaches: mild‑hybrid and plug‑in hybrid. Each uses a different combination of batteries to deliver efficiency and practical range.
- Mild‑hybrid (EcoBlue Hybrid): adds a 48‑volt mild‑hybrid system to assist the diesel engine, providing torque assistance, smoother stop‑start, and regenerative braking. It relies on a 12‑volt system for normal electronics, with a 48‑volt battery powering the hybrid system.
- Plug‑in Hybrid (PHEV): combines a high‑voltage traction battery with the 12‑volt system. The high‑voltage battery can be charged from an external plug, enabling electric‑only driving for a portion of typical urban duties, with range varying by load, driving style, and climate.
In both electrified configurations, the dual‑battery arrangement is designed to maximize efficiency while keeping traditional van reliability. The 12‑volt system remains the backbone for starting and daily electronics, while the higher‑voltage stores energy for electric or assisted propulsion.
Charging, safety and maintenance considerations
Charging habits differ by variant. The plug‑in hybrid invites routine charging to maximize electric running, while the mild‑hybrid relies on the 48‑volt system for its energy needs. Both systems are managed by Ford’s battery‑management software to protect battery life and ensure safe operation.
Important safety note: high‑voltage components are isolated from the 12‑volt system and should only be serviced by qualified technicians following Ford’s guidelines.
Practical tips for owners
To get the most from the Transit Custom’s two‑battery setup in electrified variants, plan routes with charging opportunities, monitor the electric range, and follow Ford’s service schedule. If you regularly operate in city or intra‑urban contexts, the plug‑in variant can offer meaningful electric driving, while the mild‑hybrid option delivers efficiency gains without requiring external charging.
Summary
The Ford Transit Custom uses a two‑battery architecture in its electrified variants to separate high‑voltage propulsion energy from standard vehicle electricals. A high‑voltage traction battery powers electric drive and energy recovery in the hybrid configurations, while a 12‑volt battery underpins starting, lighting, and daily electronics. Mild‑hybrid and plug‑in hybrid options use this setup differently, but the core goal remains: improved efficiency without sacrificing reliability for commercial use.
Why has my Ford Transit got two batteries?
+Why does ford transit have 2 batteries
The extra battery makes it easier to start the van in winter or in countries with cold climates. The second battery is also used in camper vans, refrigerated vans and other versions of the Ford Transit that require more electricity, for example to power electrical appliances.
How many batteries does a Ford Transit Custom have?
two batteries
While some of these Transit vans may have two batteries, instead of just one, they all use the same size battery- an H6 (also known as a Group 48). These batteries are located not in the engine compartment, but underneath the driver's seat.
What is the most common problem with Ford Transit?
One of the more prevalent issues faced by Ford Transit owners is turbocharger failure. The turbocharger is responsible for enhancing the engine's performance by forcing more air into the combustion chamber. Over time, wear and tear can lead to issues such as oil leaks or a reduction in turbocharger efficiency.
What runs off the auxiliary battery?
The secondary battery supports accessories, infotainment, and other features that draw continuous power even when the engine isn't running. Dual-battery systems became necessary as vehicles evolved. Today's cars feature power-hungry components like heated seats, navigation displays, and driver-assistance technologies.