After many years, I am giving up on Polar HRMs. They used to last, but lately, we are finding they die very quickly. New batts do not correct the issues. Done with Polar, but need to find something that works. Do not need fancy apps, storage, data crunching, etc. Just a reliable HRM that syncs with gym equipment (specifically Percor). Chest strap is preferred, but whatever reliably works. What has been working well for you? Thanks!!!