The F-type employs two batteries located in the boot; one for the stop/start and the other for the main circuit.
Both batteries I believe are AGM, acid gel batteries. Although I think judging on the size the stop/start assy it my be a Lithium ion.
I believe that you can charge BOTH batteries by hooking up to the common point under the bonnet.
A battery management system or BMS manages the normal current distribution to the batteries to maintain them during normal driving. When the ignition is switched off however, the smaller stop/start battery is disconnected from the main supply circuit via a gateway module that constantly monitors the smaller battery's voltage.
I still need to delve into the circuits a little further to be 100%. So long as you connect the negative of your Optimate, Ctek or what have you to the earth/neg stud on the chassis and the positive to the stud shown on Fig.7, you should be OK....
See here: http://www.mediafire.com/view/6gasarph66d67a5/JAF_0048_1E_-_Battery_Charging_Kit.pdf
I have several vehicles radio control planes et al that are float charged prior to me going away for up to 6 weeks at a time. I disconnect the neg only from the battery, and reconnect when I come home. My experience has been positive, without any flats.
I'm yet to try this approach on the Jaguar as I haven't got it yet (Have I Westbourne ) I would prefer not to leave electricity on when I'm away...just in case...or maybe I'll employ the other half to put it on float every week or so?
KABOOOM!
Can anyone get hold of a workshop service manual I wonder? Being a engineering/electroniccy type I like this kind of thing!