Modern rechargeable are lithium; designed to be charged and depleted and recharged; maximum battery life comes from full cycle use and not recharging over and over. Alkaline leak, just by design they are meant to be temporary and throwaway as they are sealed but significantly degrade with change in temp and humidity and various other atmospherics causing cells to swell and take the casing with them. You could buy lithium AA and AAA; a bit more expensive but lithium does not leak and far more efficient outside of extreme cold temps. I have two headlamps in my emergency kit with 2 x sets of batteries stored and taped outside the headlamp; a battery that is not cycled or connected is not under the same lifespan considerations so you can store like this and get maximum life for emergency breakout; my daily use is rechargeable lithium sealed headlamp(s) similar to
@krick3tt.
Agreed; all my headlamps and even my watches are rechargeable and it used to be a big talking point on a rechargeable watch working in a tactical or operational environment; all debunked and far more efficient with the proper experience and knowledge. Battery technology is progressing so fast these days in every area except standard alkaline; personal opinion is lithium rechargeable AA or AAA or sealed unit designed to be recharged. Does take some planning but once we engrain it, no issues IMO.