DTC B11D9-49: Vehicle Battery - Internal electronic failure: Action

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2015 Jaguar XKR-S, 2015 Jaguar XKR, 2015 Jaguar XK, 2014 Jaguar XKR-S, and 2014 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.

Check vehicle has correct battery type and size installed. Install new as required
Using manufacturer approved diagnostic system, verify vehicle quiescent current draw levels are correct using power supply diagnostic function. Rectify as required
Using the Midtronics battery tester and battery care manual, check the battery is serviceable. Install new as required
The battery monitoring system will correct a temporary battery state estimation error within a reasonable adaption time. The adaption time is dependent upon the driving time of the vehicle and may take a number of weeks