The first device with high energy density batteries from Sila is released – the fitness tracker Whoop 4.0

Fitness wearable company Whoop has announced its latest products – the Whoop 4.0 fitness tracker with a unique battery and the Whoop Body series of fitness clothing. Sportswear is equipped with the proprietary Any-Wear technology, which allows the fitness tracker to be worn not only on the wrist, but also on other parts of the body. This is the first major update to the Whoop family of devices in over two years.



Fitness trackers from Whoop have gained popularity due to the brand’s emphasis on providing detailed data that will help the user recover and improve the effectiveness of their workouts. Users especially appreciate that Whoop trackers and the companion app provide easy-to-read data on sleep quality, recovery, and exercise (using metrics such as heart rate variability, sleep duration, and resting heart rate) as a guide, and also daytime activity and level of rest.



Whoop 4.0 tracker is one third smaller than the previous version. The device includes a new and improved sensor array, an updated battery. New components include a skin temperature sensor, pulse oximeter, and a tactile alarm that can help the user to wake up from sleep using low vibrations based on sleep cycle data.

The fitness tracker supports up to 5 days of battery life, made possible by a new battery developed by Silicon Valley-based Sila Nanotechnologies. One of the co-founders of the company is Gene Berdichevsky, who previously worked at Tesla.

The anode of the battery is made of silicon rather than graphite, which provides a higher energy storage density (up to 20% more than conventional batteries, according to Sila). Higher energy density means the ability to use a more compact battery to perform the same tasks or provide the same autonomy. Sila Nanotechnologies has spent a lot of time and money searching for the ideal anode composition. The engineers had to find a way to combat the tendency of silicon to expand and degrade during charging and discharging.

And what Sila has succeeded in translating their developments into a commercial product, which means that their technology is now ready for mass use. Initially, it was assumed that it will primarily find application in smartphones. After all, there, in fact, as in wearable gadgets, batteries are needed that combine compactness and maximum capacity. By the way, batteries with Sila technologies are also planned to be used in electric vehicles, where a high density of charge storage is also very important. So the Whoop 4.0 bracelet is just the beginning.



Two new types of bracelets are offered with the tracker: SuperKnit, designed to be comfortable and durable at the same time, and HydroKnit, designed for use in water sports.

Whoop operates on a subscription model, whereby members pay a monthly fee to access continuing education, assessment, recovery and health analysis programs. The monthly fee also includes a Whoop strap. Members can purchase additional straps and accessories in a variety of colors and patterns.

Existing members will be able to upgrade to Whoop 4.0 for free. The device will also be available for purchase directly from the company with a subscription starting at $ 18 per month.

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Johnson Smith

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