phouton
(phouton)
9
Which model mouse? 10 days seems really short.
Alkalines are 1.5V while NiMH are 1.2V. I think that is responsible for the difference.
My Logitech M720 specifies 1.5V. The official specs say 2 years battery life on one (alkaline) AA, but I got 4 months out of it with my use. With an Eneloop I got about half that. The mouse goes dead at ~1V.