I have used Ikea NiMH AA in my Logitech mouse for over 1 year, giving 10 days runtime under relative hard use. The Ikea AA Alkaline seems to give some days longer runtime than the NiMH. I dunno why, though.

Also I think the NiMH batteries last some longer charging them in the new Liitokala 500S. This could be placebo effect, as I like the new charger better :smiley: