Edison invented a iron battery that can last 100 years.
Some BMW cars have lithium batteries.
Tesla has an 18v lithium.
Some sodium models coming online.
Guess one could even use nicad pack.
Are any of those proven safe in Bolt?
It's certainly possible that a different battery will work well enough with a Bolt. Why try to reinvent the wheel though? What's so terrible about just going with the proven AGM battery, that amortized out might cost 25 bucks a year. And it's plug and play. It fits right, the hold down fits, and the cables fit.
And call me odd, but even if I was going to sell the car soon, I'd feel better selling it with the proper battery. I want the next owner to have a good Bolt experience.
I recently traded in my 2011 Cruze Eco with a recent Mobil 1 oil change, excellent tires with plenty of tread, a recent coolant change, a new air filter, and a top of the line two year old AGM battery. I hope the next owner loves my old Cruze.
And the dealer, after driving my Cruze, gave me more money for it than they first offered on paper. The young salesman had to get another employee to actually drive it though, because he didn't know how to drive a stick.

The two of them took it for a spin while I hung out in the Chevrolet showroom looking at a Ford Shelby GT 500 they had on the floor.