The Field watch has a semi-transparent dial which allows around 30% of light to travel through the dial to the solar cell beneath. This cell converts any form of light* into electrical energy and stores the power in a secondary rechargeable battery. On a single charge the movement can be powered for up to 5 months.
While it essentially works in the same way as a quartz watch, the movement utilises a rechargeable lithium battery rather than a silver oxide battery. The battery has a 10-year lifespan compared to the shorter lifespans often found in standard quartz movements. This has obvious environmental benefits and means less time and money spent on battery changes.
The movement features a power warning function. It will tick in two-second intervals when power is low. This power warning function will last for 1 day.
* While the watch can run off nearly any light source it is natural daylight that is most effective in charging the cell. On a cloudy day, it takes around 15 hours for a full charge from empty. If reliant only on fluorescent light inside then it would take around 200 hours. You can see more information regarding relevant charging times here. Please note these are only rough guidelines and there are many factors that can impact the charging time.
We strongly recommend storing your watch on the side, near a window or other light source and not letting the battery deplete fully as the charging times from empty can be lengthy.
Essentially, if you wear your watch daily it should continually take in light sources and should function well, if it is left in darkness for prolonged periods of time it may take a while to become operational again.
You can pre-order The Field Watch now for delivery at the end of September.
Click here to find out more.