K4 Boost Battery Strap for Quest 3/3S
- for Quest 3/3S
- Extended Play: Keep the MR sessions going with 3 extra hours of battery life. Optimized for peak performance based on your gaming needs.
- Dual Fast Charging, Twice the Speed: Simultaneously charge the K4 Boost and your Quest 3S/3 with the DualBoost Power system. Fully recharge both in just 2.5 hours with a 45W adapter, delivering 25W power to your Quest 3S/3 while charging the internal battery.
- Comfort and Balance: Ergonomically designed rear headrest with thickened padding reduces facial pressure, while enhanced counterweight eases strain on your head and neck.
- Safe and Reliable: The premium-certified batteries and system come with multiple layers of protection, including essential UL, EN, and FCC certifications. Every material is rigorously tested in TUV labs for safety and durability.
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Easy Wear and Quick Adjustment: The 52° damping hinge allows easy on and off, while the quick adjustment knob ensures a perfect fit.
送料無料 & 最短お届け
送料無料 & 最短お届け
3,000円以上のご注文で送料無料。迅速な処理と安心の配送体制。日本国内へのお届け目安は 2〜5営業日 です
※詳細は配送ポリシーをご確認ください。
30日間返金保証
30日間返金保証
商品に破損がない状態であれば、理由を問わず 30日以内の返品で全額返金 いたします。
商品が倉庫に到着し検品が完了次第、返金手続きを開始いたします。
※円滑な返金のために必要な条件については、返金ポリシーをご確認ください。
安心保証サービス
安心保証サービス
当製品は 18か月の保証対象 です。万が一不具合が発生した場合も、修理または交換にて確実に対応いたします。
※詳細は同梱の保証書または保証ポリシーをご確認ください。
生涯カスタマーサポート
生涯カスタマーサポート
私たちは末永くお客様に寄り添います。必要なときはいつでも、専門スタッフによるサポートをご利用いただけます。
※メールまたはライブチャットにて、お客様のご都合の良いタイミングでご連絡ください。
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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
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—
—
—
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.
