These two designs allow storage of AA and AAA batteries on a pegboard. I keep my recharger just below the pegboard. Spent batteries go directly into the charger. Once charged, they get moved into the holders on the pegboard. The rule is, if a battery is on the pegboard, it is fully charged and ready to use.

I printed with supports (for the upper pegs) and 75% density so the the pegs would be strong.