Unless this is for a portable system, for hiking or bike riding where weight and backwoods electrical generation are a prime consideration, Then consider adding a solar panel to your vehicles 12v System, and using a 12v charger which can cover a wide range of batteries.
My Nitecore I4v2 can do AA or AAA NIMH and 14500 or 18650 Li ion cells, and can work off of a 12v input.
Hardly the best charger available but under 20$ and can cover all my cylindrical battery needs.
For portable USB power, they have many packs which take 18650 cells
I use a single cell USB charger under 4$ that takes an 18650 cell. I have over a dozen I salvaged from old laptop batteries. These cells are not high capacity cells, but they have usable capacity left, and I have some quality 3400mah Panasonic cells I bought which are worth more than 2 laptop extracted cells in capacity.
