My V1 swim watch has been very unreliable for my last few swims. Stopping, data loss, time reseting itself etc but no 'low battery' indicator! Also the display has been crisp and contrast-rich which made me think the battery was fine.
Anyway, today I'd got the box of CR2032 in my hands so swapped it over.
Looks like it has been 11 months since the last replacement so perhaps not unsurprising. Let's hope the fault is resolved...
