At the risk of asking a stupid question: Is that swap a drop in? No changes to charging system, etc?
There are no stupid questions.
Technically yes, you do Need a lithium battery compatable regular/rectifier...and I have one on the way from Rick's Electrics.
Take 10 identical bikes, all with lead/acid battery reg/recs, and 9 of them will use a lithium battery with zero issues.
The 10th, it will blow a fuse, burn wires, or fry an ecu.
No rythme or reason...other than you should have a reg/rec compatable with a lithium battery.
I wasn't taking any chances.
Oem reg/recs die randomly on a regular basis, or fail at the worst time.
Two summers ago the reg/rec failed in my friend's Buell while he was riding.
There was smoke from under the seat, and the bike started cutting in and out.
He stopped and called me.
He lifted the seat to find a very hot and sizzling battery that had swollen just shy of exploding...as it was overcharging.
It was so big it was hard ro remove it too.
Given I have a 21 year old bike, and a reg/rec that was packed with dirt(now clean), I thought better safe than sorry, and was going to replace it anyway.
Rick's Electric had a lead/acid reg rec and a lithium one for about $130, and a higher end lithium that is mosfet with supposedly better cooling, for $165, and that is the one I bought.
I'll post pictures when it shows up.