About this deal
Indeed the car is under a leasing contract paid by the company I work with, so the costs are not really an issue. The issue is, where I live (south of France) the 3 JLR dealers in 80 kms range are so fully booked they cannot provide an appointment before May... Like I said the symptoms are getting worse and worse, so I started looking for a solution on my own (I can get an Exide EK151 at ~70 euros here).
Starting with MY21 the small auxiliary battery has been discontinued and they only have the starter battery.
Free Delivery is not available for Over-Sized parcels, such as Exhausts, Radiators & Headlamps - For details on these items please see the 'Oversized Items' section below. Disconnect and insulate the large cable (DC-DC converter ground (earth) ) from the Battery Monitor System on the negative post
Every 3 years I conclude. Even if you have a Bosch S5 starter battery and the AUX is at end of life. Or have had 3 years of battery trouble free motoring. There are slight discrepancies in the dimensions but I don't think that will matter. 2mm higher for the B14155 isn't much. Smaller dimensions will always fit in.
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Some six months later I started getting the dashboard warning "Brake pedal feel reduced. OK to drive with caution." On MY18-20 cars this is an indicator for approaching end-of-life of the smaller battery, that is mainly supporting the break system. Don't ignore this warning! Better get the battery replaced soon. If they were my 12v batteries I would source them myself and buy ones with manufacturers guaranties (1-5 years) and after hearing Hairy-Cheeses experience, I would change them myself.