I have the Guardian Dual-Function Light, attached to the Citizen Canine. For time reference, it was the first batch of Citizen Canines (it was a birthday present for me). I use the Light on a daily basis on the steady mode, usually for a few minutes at a time, to assist me on nighttime walks & trips with Rosalind (I have almost no night vision at all). The battery which came installed in the Light lasted several months -- I think at least four -- but subsequent replacement batteries (the two CR2032s) do not last well at all. After a month, the Light gets dim about thirty seconds after I turn it on.
Which batteries do the rest of y'all use? And where do you obtain them? Has anyone else noticed a decrease in function with replacement batteries?