Hello, my HRM dual is draining the battery really fast lately. I use it 6 to 8 hours a week and I had to replace it every 6 months in the last two years. Shouldn't the battery last (much) longer?
I am always using Varta battery's or so (so no cheap noname) and I always remove the electronic part from the stap.
Does anyone else have this issue? Any chances to fix it?