Don't fret having more than one battery brand. It's no harder to keep up with than having ketchup, mustard, and mayonnaise in the fridge.
If you were running a worksite mobile with a crew then yea, but not around your house/shop.
I have Milwaukee, DeWalt, Ryobi, Hercules, and one rogue Ingersoll Rand grinder(not impressed). I keep them grouped as to where I'm keeping/using them. But that allows me to get good deals, on sale or marketplace.
Are you looking for work lights for garage, engine bay etc? Look into the magnetic palm sized lights that recharge with usb. They are the bomb.
I would go Ryobi before Bauer.
I admit I had to tie a sock around the Ryobi fan to keep it from rotating down when in use.....
I have a usb rechargeable fan that moves alot of air compared to the Ryobi as it is much larger. But you can't just change out the battery...
I have some adapters just in case I need them but I don't use them other than to try them after purchase. I think they would be great for stationary stuff but for handheld tools they add to the bulk and vibrate around....