The battery keeps getting drained and dying out
If this problem only happens after the car has been sitting for a week or so, this may be caused by something else. Running the engine or driving the car may solve the problem. If it does not, it is also possible that there is a problem with the electric/charging system of your car. If the alternator is faulty and overcharging the battery, it may cause the battery to lose its charge faster than it should. Have a certified technician, like one from YourMechanic, come and complete an inspection of the electric system in order to properly diagnose your problem and make the necessary repair.
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If this problem only happens after the car has been sitting for a week or so, this may be caused by something else. Running the engine or driving the car may solve the problem. If it does not, it is also possible that there is a problem with the electric/charging system of your car. If the alternator is faulty and overcharging the battery, it may cause the battery to lose its charge faster than it should. Have a certified technician, like one from YourMechanic, come and complete an inspection of the electric system in order to properly diagnose your problem and make the necessary repair.
Generally, the issue with charging in situ is if the charger has a voltage excursion (above 14 volts) which, if it occurred, could damage the PCM and vehicle electronics. Just to be on the safe side, Jaguar simply just says to disconnect the battery. If you are using a high quality professional charger, you are probably safe in leaving the battery connected while charging.
The charging circuit is running through the battery and the likelihood of runaway voltage if you are using a decent charger is low. Note that, even if you use a shut off, lead acid batteries will self discharge anyway, so you will still have to charge the battery every several weeks if you are not using the car. Watch out for gas in the tank oxidizing. Keep the tank full and use fuel stabilizer applied to fresh gas. If the gas goes bad and plugs injectors, you will wish you had "only" a dead battery. If you are continuing to have problems with your battery, a qualified professional from YourMechanic can diagnose the charging issue so that you will not have to keep charging it.