I changed the battery on my HRM Pro just after warrantee ended, and it never turned on again. Tried Varta, Energizer, tried resetting the strap by putting the battery upside down... I tested the batteries with a multimeter, both were 3.1V. The strap just never turned on again even though it worked fine for 2 years.
I contacted Garmin support, and they had the audacity to propose to me to return my dead strap and order an HRM Pro Plus full price in replacement. I get that the warrantee ended, I'm might not entitled to a full price replacement, but this problem is documented everywhere, people have problems left and right after changing batteries on these straps. They took 2 weeks to answer my support ticket, never apologised and proposed to me a new strap full price. No acknowledgement of the issue, no solution provided, no discount on a new strap, nothing.
So just a heads up for other people owning or planning to buy these straps, be aware it might just be disposable e-waste that could die simply after changing batteries. And Garmin does not seem to care. Pretty sad.
