K4 Boost バッテリーストラップ（Quest 3/3S 用）
長時間プレイを実現
最大3時間の追加バッテリー寿命で、MRセッションを途切れさせずに楽しめます。ゲームの使用状況に基づいて最適化されたパフォーマンスを提供。
デュアル高速充電で2倍速
DualBoost Powerシステムにより、K4 BoostとQuest 3/3Sを同時に充電可能。45Wアダプターを使用すれば、Quest 3/3Sへ25W給電しつつ内部バッテリーも充電し、わずか2.5時間で両方をフル充電。
快適さとバランス設計
厚みのあるパッド付きリアヘッドレストが顔への圧力を軽減。さらにバランス設計で頭や首への負担を減らし、長時間の使用でも快適です。
安全で信頼できる品質
プレミアム認証バッテリーと保護システムを搭載。UL、EN、FCCなどの必須認証に対応し、すべての素材はTUVラボで安全性・耐久性を徹底テスト済み。
簡単装着＆素早い調整
52°ダンピングヒンジで着脱がスムーズ。調整ノブでぴったりフィットさせることができ、誰でも快適に装着可能。
Fast, Free Shipping
Fast, Free Shipping
Enjoy free shipping on all orders over $20. Experience fast processing & reliable delivery, with your order arriving in just 3–7 business days across the U.S.
※For more details, please see our shipping policy.
30-Day Money-Back Guarantee
30-Day Money-Back Guarantee
Shop with confidence and enjoy our 30-day money-back guarantee. Simply return your undamaged products within 30 days for a full refund—no questions asked. Once your item reaches our KIWI warehouse, we’ll quickly process your refund.
※For more details, please see our refund policy.
Hassle-Free Warranty
Hassle-Free Warranty
Enjoy peace of mind with our 18 month warranty. If anything goes wrong, we’ll make it right—whether it’s a quick repair or a full replacement, you’re always covered.
※For full details, please refer to the warranty card or our warranty policy.
Lifetime Customer Support
Lifetime Customer Support
Count on us for the long run. Enjoy lifetime customer support from our expert team—ready to help whenever you need it.
※Reach out via email or live chat—we’re always here for you.
Pay with Ease
Trusted Delivery
Which Battery Head Strap is Right for You?
Zero face pressure and lightweight comfort—ideal for casual gaming and entertainment.
Stable, secure fit with extra support—built for intense, high-motion gaming.
Built on the stable, lightweight K4 Boost design—now with seamlessly integrated audio for total immersion.
449g
364g
459g
Yes
Yes
Yes
5300mAh / 20.4Wh
5300mAh / 20.4Wh
5300mAh / 20.4Wh
Up to 2.5 hrs
Up to 2.5 hrs
Up to 2.5 hrs
Up to 45W
Up to 45W
Up to 45W
HMD + Strap
HMD + Strap
HMD + Strap
Forehead
Face
Face
Yes
—
—
—
—
On-ear headphones, high-quality spatial audio
Let’s Answer Your Questions
Is this head strap better than the original one on the Quest 3/3S?
The original strap is lightweight and great for casual use, but the K4 Boost takes comfort and performance to the next level. It adds up to 2-2.5 extra hours of battery life, fast-charges both the headset and strap, and offers better weight balance with zero facial pressure. If you play for long sessions, it’s a solid upgrade.
What’s the difference between this strap and the H4 Boost?
The K4 Boost is designed for high-intensity movement and active gameplay, while still delivering excellent battery life. In contrast, the H4 Boost prioritizes comfort and extended playtime — making it ideal for relaxed gaming, movies, or work.
Will the extra head strap feel heavy?
Not at all. It’s built with industry-leading weight control and a balanced design that actually feels more comfortable than the original strap — even during long sessions.
Is the battery safe?
Yes, absolutely. We use high-grade lithium batteries that pass strict safety tests from the start. Plus, the product comes with an 18–24 month warranty or replacement policy, depending on your region.
Where can I find the user guide and warranty manual for the K4 Duo head strap?
You can download both the User Manual and Warranty Guide from our official support page. Just scroll to the “Battery Strap for Quest 3/3S (KW-QS02B-SPF)” section to find the PDF files.
Customer Reviews
I love it
The product is awesome, gives extra comfort with additional 2 to 2.5hrs game time. Easy to install and o love it.
Kiwi continues to impress! My quest 3 went from painful within 10 minutes, to comfortable as long as I want to play. This is my family's third kiwi product and I will continue to recommend them highly!
K4 Boost Battery Strap for Quest 3/3S
I have to tell you that Kiwi has such a great fitting straps for the quest two and the quest three. The adjustable dial on the back, makes it absolutely the best thing ever. And don’t get me started on how great day hand grips are on both the quest two and the quest three love all the kiwi designs.
Reviews in Other Languages
Easy to put together, very comfortable and a good counter balance to the Quest's forward weight. Love it!
I have used the old Kiwi Headstrap with my Quest 2 for two years.
So this time, for the Quest 3, I ordered the K4 Boost Battery Headstrap, and it's even better.
The comfort level and battery are perfect, and the hidden control at the back looks neat and convenient.
If you do not already have a 45W charger, you must buy one to make the best use of the battery head strap.
