WHOOP Battery Pack 4.0 – Portable, Wearable, Water-Resistant Charging Component 4.0 Wearable Health, Fitness & Activity Tracker, Onyx

Great charger and does exactly what is needed. I got a second one because I travel a lot and wanted one I can just keep in my luggage at all times.

Was convenient to get my Whoop battery delivered quickly by Amazon when I got in a pinch while moving and could not find my battery. With the hours ticking away until the Whoop would stop tracking data, I was really grateful for Amazon Prime with quick delivery. I found the original battery and I now have the extra as a backup. The new one works great and appears to be a standard Whoop battery.

Daughter lost her whoop charger. This was the perfect replacement!

The battery pack is incredibly compact and lightweight, making it easy to toss into my gym bag or backpack. The design is sleek and seamless, matching my WHOOP perfectly. This thing charges my WHOOP ridiculously fast - we're talking 0-100% in under an hour!

Outstanding product.

Easy and quick to charge.

The WHOOP Battery Pack 4.0 has proven to be a valuable accessory for my WHOOP fitness tracker, providing a convenient solution for charging on the go. Its portability is a standout feature, allowing me to easily carry it in my pocket or bag. The compact size ensures that it doesn't add unnecessary bulk to my belongings, making it an ideal companion for travel, outdoor activities, or simply when I'm away from a power source for an extended period.Mounting the Battery Pack on the WHOOP fitness tracker is a breeze. The magnetic attachment system ensures a secure connection, and the alignment is straightforward. The tracker locks into place effortlessly, and I can confidently wear it while the Battery Pack charges. The convenience of this design allows me to continue tracking my data seamlessly without interruption.However, one downside I encountered was the ease of losing the Battery Pack. Unfortunately, I misplaced the original one that came with my WHOOP fitness tracker, and had to purchase another separately. The small size makes it susceptible to getting misplaced or easily overlooked. It would be helpful if WHOOP could consider implementing some form of attachment or storage mechanism to mitigate the risk of losing the Battery Pack.Additionally, while the functionality and convenience of the Battery Pack are impressive, the price of WHOOP accessories can be a deterrent. The cost of replacing the Battery Pack or purchasing additional WHOOP accessories can add up quickly. It would be beneficial if WHOOP offered more affordable pricing options for their accessories to make them more accessible to a broader range of users.

Just like charger from manufacturer.