I bought a pack of tealights each powered by a single CR2032 (flickering LED; builtin timer turns it on every evening for 5 h). My wife loves them, but after just a fortnight each tealight's CR2032 has dropped to 2.2 V (under load), and the LED has become invisibly dim. Discharge curves suggest that the mean load is 2.5 mA (which a CR2032 can maintain for 70 h, yielding 170 mAh).
Because I'd rather not replace several CR2032's per week, I'd like to replace the CR2032 with a pair of alkaline AA's.
AA's have roughly 10x the mAh, but in published discharge curves for AA's, the lowest testing current I found was forty times higher than my load.
Logging data for over a month would take unusual patience. Has anyone done so?
To be precise: at a 2.5 mA load, how many hours will it take for an alkaline AA (of whatever brand name) to discharge down to 1.1 V? (So a pair, down to 2.2 V, to emulate the CR2032.)