HRM battery change

Once again I spotted failure of the HRM belt by super-high heart rate data causing the 935 to indicate a massive effort. The run on Sunday was a few km more than intended but was at a gentle pace.

Just before bed tonight I've fitted a new CR2032, as before it needed 2 attempts to restart and be paired.

It's over a year since last replacement so that's fair although I've not run much so it's not had heavy usage.