After that to ALL of mine straps owned, two Hrm Run and now a Hrm Pro, has happened the same thing, I'm sure of that: after changing factory battery the strap drains all brand new battery that you put in in a few hours or days or little more but there's nothing to do, it's like they were short circuited on the strap, when you wear the first time all seems working then the battery get discharged. I tried everything, even put the battery on reverse side for a while but there's nothing to do. I'm sure that Garmin is aware of this problem cause on the web there are many cases like mine, I also suppose it's done on purpose otherwise it's unesplicable how this happens and how they didn't fix it. You can change under warrenty the first time but at the end of two years you are forced to buy a new one since the factory battery lasts 1 year. For me this situation it's a shame since that this are very expensive devices, next time I think I'll buy a normal strap from another brand giving up to running dynamics and other features.
