few years old now but this thread covers a lot of stuff

no problems with oem or aftermarket charging system in the bike, do require a specific trickle charger

remedies for hard starting in cold conditions

lithium batteries can be a problem when run down with parasitic draw when left for long periods, sometimes they come back, sometimes not; some top of the line lithium batteries now have a 'restart' or 'recharge' feature which keeps a reserve charge for starts in this situation

These are pricey, $399 here in the states. I imagine a lot more expensive in OZ. 

You'll read on their web site that the re-start battery fits HD models. Then later you'll read they don't recommend it for large or modified motors. They're just cover their ass by saying that. Myself and everyone else that I know using this battery has them in a Twin Cam 124" bikes. 

Also, your bike will charge the battery just fine. And you can use a standard battery charger to charge these, as long as you watch and don't let them cook. Then they will be damaged. Also they make specific tender style chargers that know when to shut off, and not keep floating the charge like lead acid style batteries tolerate. In reality you shouldn't need to watch it. They won't drain down unless you have some parasitic charge pulling from the battery. Or it's just been a very long time since it's been used. 

They also just came out with a plug in switch to activate the re-start feature if you can't access the top of the battery easily. 

Edit, $669-$979 in Oz.

Charged it up

Put it in

Starts first time ,battery voltage dial indicates 13v on start up ,then settles at 14-15 when running (same as the old battery).

5 year warranty

So far so good

Never seen a bike battery with a 5 year warranty. 

New battery for Road Glide 12 cost for old lead, under Au$400. but lasts over 7 years, no problem on tender when not ridden. 

Lithium, is obviously a step forward, weight and like a 800 CCA. wait and see, aye?.