it doesn't make much difference whether the tender is connected to the battery or to cig lighter aside from the fact that cig lighter will require you to open the window a little. with a battery connection, the front trunk is opened a little. i find it easier to coneect to the battery for gallardo. if i had a murci that isn't wired yet, i would use cig lighter.

weathertech has a $59 tender that looks like a ctek unit.

I have my BT JR. positive attached to the battery and neg grounded to the latch mechanism.
There's no other exposed metal in the boot.

I run the wires directly to the connectors on the battery. The bolts that tighten the connectors around the battery posts had some extra length and so I slid on some crimp connectors (crimped to my wire of course), followed by lock washers and nuts.
I didn't want to have a squashed wire routed through a watertight seal on the door, window or bonnet so I ran it to the hole in the right front grill where there is a removable plastic cover for the tow bar. There is still plenty of room for the bar and I've attached the cable to the cover itself in a way that keeps it hidden until you pop it off.
Complicated? Maybe, but it's perfectly hidden, accessible from outside the vehicle and has a direct connection to the battery.

Perfecto! And, my mechanic was impressed.

How old is the battery? What about replacing it with a new battery? besides the fact that once a battery died once, it will tend to loose charge again easier. If your battery is old, you might as well replace it so you don't have to worry about how to charge it back this time.

I agree with Godzilla, if it was me I would replace the battery. It is just too important to worry about when or where it will die next. Not worth the stress.

Thanks for the replies on where to connect.

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2008 Gallardo Spyder Sold
2012 Gallardo Spyder

I just jumped it using my 650i .. now car starts up like new

Thanks everyone!

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2008 BMW 650i (the wife)
2004 Lamborghini Gallardo (the mistress)

Don't judge me because my mistress is older than my wife.

you should charge it or go for a long drive to charge it. so the wife helps the mistress afterall.