Jaguar E-Pace Battery: Specs, Fitment & Common Faults

On the E-Pace, a software update has genuinely cured a battery drain problem on related models — worth asking about before assuming a hardware fault.

Illustration for editorial purposes

OEM Part Number: J9C5445

Genuinely important to know, P300e PHEV: the 15kWh high-voltage drive battery is a completely separate component from the standard 12V starter battery covered here — don't confuse the two. The 12V system also includes a genuine battery monitor sensor on the negative terminal that needs replacing alongside the battery on some builds.

2018-2020, standard H6 fitment, genuine reference	Jaguar OEM: J9C5445 (also referenced as T4N13266)
Important	Jaguar's system requires all further factory diagnostic procedures after a battery swap, since the vehicle's electronics need to recognise the new battery for correct charging behaviour.

The Part Everyone Blames First, Not Always Correctly

A car that won't start gets blamed on the battery more often than any other component, and it's right often enough to make that assumption a reasonable first check. But it's not always the actual cause, which is worth knowing before spending money on a replacement that doesn't fix anything.

Before you buy: battery size, capacity and type (standard vs AGM/EFB for stop-start systems) vary by trim and engine. Always confirm against your VIN before ordering.

What It Does

The 12V battery provides the power needed to start the engine and runs electrical systems when the engine isn't turning. On cars with stop-start technology, the battery works much harder than on older designs, since the engine switches off and restarts far more frequently — which is exactly why these cars need a specific AGM or EFB battery type rather than a standard unit.

A Genuinely Useful Piece of Context Worth Knowing About Battery Drain Diagnosis — Jaguar E-Pace Battery

If you're facing a persistent battery drain, this is genuinely worth knowing: documented cases on related Jaguar models describe a software update genuinely curing a recurring battery drain problem, worth asking a dealer whether this kind of fix has been applied before assuming a hardware fault.

A genuinely alarming, honest account worth knowing about how extensive diagnosis can become: documented cases describe a dealership keeping a car for two and a half weeks before determining the main electronic control module wasn't switching off properly, with replacement requiring removal of the seats.

It's also genuinely worth knowing that a diagnostic code referencing a fault with the dual battery fuse box has been documented as a specific, real cause of drain on related models.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Battery Guide for warning signs to watch for, confirming fitment against your VIN, and matching the right technology (standard, EFB, AGM) when buying aftermarket.

More Jaguar Battery

The same part, covered across other Jaguar models.

Jaguar E-Pace Battery: Specs, Fitment & Common Faults

OEM Part Number: J9C5445

Shop for This Part on eBay

A Genuinely Useful Piece of Context Worth Knowing About Battery Drain Diagnosis — Jaguar E-Pace Battery