hi
YES it fine, can recomend CTEK smart chargers , can be left on all the time, with battery in situ, will keep the battery tip top,
I've got one on my S-type R and never had any faults in over 7 years
just check the battery vent tube is present, should be a vent pipe on the battery that goes out the back of the car, so any gases produced dont build up in the boot, sometimes left off when a new battery is fitted
cheers
Joe