Telephoned response to me from Decarie Motors, Montreal

Beware! being a donor is NOT recommended as it may upset the electrics & electronics on-board the LR3.

in an emergency, :-
a) the battery is on the starboard side of the engine compartment, as shown in the Owner's Handbook in Figure E80818 on page 215
b) Remove its underhood cover as shown in Figure E80386 on page 206.

it's smart to practice this in daylight on a warm day, rather than attemping it for the first time 21h00 at night in -14 deg C windy conditions. The tabs on the covers are plastic and easily break in cold conditions.
c) on LR3, use the battery positive as the vehicle positive (+) connection point
d) on LR3, use a good earthing point as the negative (-) connection point -

DO NOT USE the negative terminal of the battery.