The Reserve Strap is a specialized Thermoset Elastomer Silicone band that contains embedded lithium polymer cells that recharge the Apple Watch battery providing 167% more power than without the band. The Reserve Strap uses the watch’s hidden accessory port. The developers claim the product can add more than 30 hours of additional power to the watch.
The Reserve Strap weighs 65 grams, is 25mm wide, and measures between 3-9mm thick. The strap comes in white, gray and black, fits wrist sizes from 130-210mm and fits both 38mm and 42mm watch sizes. The developers state that the product is as resistant to water as the Apple Watch and it doesn’t affect any of its functionality.
Recharging the Reserve Strap is done via a micro USB connection and features a pass through system so that both the watch and band can be charged at the same time.
The Reserve Strap costs $249.99, and begins shipping November 3, 2015. For more information, click here.