It becomes an engineering problem when you are trying to make it small and light.
I recently replaced the battery in my chest strap heart rate monitor. And I found I was lucky--turns out the seal had slipped and it hadn't been waterproof since the last battery change.
And I think the sealing mechanism probably increases the device volume by 50%. As a chest strap that's not a big deal.
I recently replaced the battery in my chest strap heart rate monitor. And I found I was lucky--turns out the seal had slipped and it hadn't been waterproof since the last battery change.
And I think the sealing mechanism probably increases the device volume by 50%. As a chest strap that's not a big deal.