I'm guessing $89.99 for a pair of lithium batteries is a short deal, if not already over, to get people to switch to the new lithium tools. Like I said, the website says you only get 1 for that price, and I can pick it up at the store. Doubtful the store has a better deal, though I'll check tomarrow because if I can get TWO for that price then those + the light seems like a good deal. I was already thinking about some other ONE+ tools anyway...
As far as modders are concerned, you would be better off buying old NiCd packs and rebuilding them with NiMh cells @ 5000Ah (more than twice the lithium battery) at a cost of around $75.
I think this whole move to lithium by Ryobi for the ONE+ system is a lame marketing gimmick, at only 2.4ah. You can do that with NiCd cells for way less money. Their lithium packs should be closer to 6ah given how large they are.
Can anybody confirm if normal NiCd ONE+ packs have sub C cells inside? Or for that matter, what cells are in the lithium battery?