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Hi Sheela, With an 8 year old battery it is simply waiting to fail. These modern cars have so many electronics going on in the background that the quiescent battery drain can be quite high and a car like yours left to sit around for a week or so will have a low battery - even when the battery is relatively new. The recommendation is typically to replace the battery in a Modern Jaguar at 5 years. If I were in your position, I would be looking for a new battery replacement and ensure you get a premium battery for a premium car, AND from a reliable supplier. There have been a number of reports of batteries failing after only a few months, so you want the back-up of a premium supplier for a no quibble exchange. Note that if you plan to change the battery yourself, then the car's ECU needs to be "informed" via a Jaguar diagnostics system that a new battery is in place in order that it can reset the charging rates, N6 JMX

John thank you very much as well for weighing in with your reply as well. its always reassuring to have more than 1 opinion be the same giving me the confidence its reliable information. in kind i'll let you guys know the outcome and hopefully this helps everyone else too should such an issure occure to them too. thanks again for your time and effort!

Hi Dias and Sheela. Jim is absolutely correct. Your cars are very heavy battery users and at 5 years you should be looking at replacement as a precaution unless you are prepared for it to fail at the most inconvenient of times 🙂 If you are only doing short(ish) journeys the car will not have chance to fully charge the battery. Unless you are doing long runs every couple of days, I would be looking to use a battery maintainer once a week (I use a Ctek). Only comment on Jims advice would be to add that if you don't "update" the car that a new battery has been added the car will eventually work it out for itself as it "checks" the battery every few months by discharging it down to 75% capacity by limiting charge voltage to 12.2v. This is another reason to use a maintainer, as if the car has just done a "check" when you park up for a few days your battery may well already be down to 75% of its potential capacity. Another thing to look out for is if the Stop/Start works as the car will only Stop/Start when it is sure there is enough battery capacity to re-start. Regards John