It’s opt-in though?

I was sure that alkaline has a higher energy density than NiMH but you are right, they don’t. https://en.m.wikipedia.org/wiki/Comparison_of_commercial_battery_types Thanks for the correction.

Man chill, he’s right, single use batteries have a higher energy density than rechargable ones. And somehow everybody is misreading that OP was talking about built-in chargers.

Not an argument not to use rechargable ones though