WHOOP Battery Pack 4.0 – Portable, Wearable, Water-Resistant Charging Component 4.0 Wearable Health, Fitness & Activity Tracker, Not Compatible with Gen 5, Onyx

This 4.7/5 figure is a composite editorial score — our weighted assessment of published specs, manufacturer data, and verified-owner reviews. It is not based on hands-on testing and is not an average of customer reviews. How we score.

The WHOOP Battery Pack 4.0 – Portable, Wearable, Water-Resistant Charging Component 4.0 Wearable Health, Fitness & Activity Tracker, Not Compatible with Gen 5, Onyx is a kids GPS trackers product from WHOOP. Manufacturer-stated features and specifications are listed below. Based on the manufacturer's published listing and aggregate customer ratings — a research summary, not a first-hand product test.

Key Features

• ✓ FSA/HSA: WHOOP is FSA/HSA eligible! As a certified retailer, you can purchase your WHOOP 4.0 Battery Pack directly with your FSA/HSA card at checkout.
• ✓ LONG-LASTING POWER – Get continuous data for days on a single charge with our battery pack that enables you to charge on-the-go while you wear it.
• ✓ DURABLE & WATER RESISTANT – Designed to provide long-lasting power for years to come. P68 dust-proof and water-resistant up to 1 meter for 2 hours.
• ✓ COMPACT & PORTABLE – Compact and lightweight, making it easy to carry with you wherever you go. Whether you're traveling, working out, or simply need to extend your WHOOP tracker's battery life, this battery pack is the perfect solution.
• ✓ EASY TO USE – To charge your WHOOP 4.0 Health and Fitness Tracker, simply slide the battery pack on your device for charging on-the-go. Use the included USB cable to recharge your battery pack from a laptop.