--- product_id: 188966521 title: "- Freestyle Comfort 16 Cell Battery" brand: "fergrelm h" price: "€ 1176.38" currency: EUR in_stock: true reviews_count: 8 category: "Fergrelm H" url: https://www.desertcart.be/products/188966521-freestyle-comfort-16-cell-battery store_origin: BE region: Belgium --- # Fast 6-hour recharge 16-cell high capacity FAA-approved for travel - Freestyle Comfort 16 Cell Battery **Brand:** fergrelm h **Price:** € 1176.38 **Availability:** ✅ In Stock ## Summary > 🔋 Power your freedom, wherever life takes you! ## Quick Answers - **What is this?** - Freestyle Comfort 16 Cell Battery by fergrelm h - **How much does it cost?** € 1176.38 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/188966521-freestyle-comfort-16-cell-battery) ## Best For - fergrelm h enthusiasts ## Why This Product - Trusted fergrelm h brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unmatched All-Day Power:** Up to 16 hours runtime on setting 1 keeps you powered through your busiest days. - • **Built to Last 300+ Cycles:** Durability you can trust with a built-in LED gauge and quick TEST button. - • **Travel-Ready & FAA Approved:** Lightweight and airline-approved for seamless oxygen therapy on the move. - • **Rapid Recharge, Minimal Downtime:** Fully recharges in just 6 hours so you’re ready to go when life calls. - • **Lightweight Design, Heavyweight Performance:** Only 6 lbs total with battery installed—comfort meets endurance. ## Overview The Freestyle Comfort 16 Cell Battery is a premium lithium-ion power solution designed for the FreeStyle Comfort Portable Oxygen Concentrator. Delivering up to 16 hours of runtime on the lowest setting, it doubles the capacity of standard batteries with 13,400 mAh. FAA-approved and lightweight at just 6 lbs installed, it supports active lifestyles and extended travel. Fast 6-hour recharge, built-in LED charge indicator, and over 300 recharge cycles ensure reliable, long-lasting performance for professionals on the go. ## Description The CAIRE FreeStyle Comfort 16-Cell Battery Pack is a genuine extended power solution for the FreeStyle Comfort Portable Oxygen Concentrator. This high-capacity lithium-ion replacement battery delivers up to 16 hours at setting 1 or 8 hours at setting 2, making it ideal for extended flights, long road trips, and active daily use. With 13,400 mAh capacity, the battery recharges in about 6 hours from empty to full using AC, DC, or the optional desktop charger. Built to withstand 300+ charge cycles, it offers lasting reliability and includes a LED charge indicator with TEST button for quick power checks. Designed for convenience, the 16-cell pack weighs just 3.1 lbs and measures 7.3 × 3.1 × 2 inches, keeping the concentrator lightweight at 6 lbs total when installed. FAA approved for in-flight use, this official CAIRE accessory (BT035-1S) ensures safe, portable oxygen therapy wherever you go. Review: Just what I needed , more time between the charging plug ! - This 16 cell POC battery is just what I needed , the stock battery works just fine but needed more time between recharging. I ordered the battery , got here faster than expected. Swapped out the old battery and replaced it with the new battery and about six hours later was fully charged. It also fit the carrier , just unzip the expansion part of the carrier, the whole thing is about an 1 1/2 inches taller . Now I can go to the doctor appointment without dragging along the 110 AC charger . If you’re on O2 24/7 this will get you out in the world a little longer without fear of a low battery . Review: Good Heavy - Be prepared for a heavier load with this longer life battery! I purchased a backpack concentrator carrier due to the increased weight! The battery is great! Easier to relax when out, not concerned about battery life! ## Features - Extended Runtime – Enjoy up to 16 hours of power at setting 1 (8 hours at setting 2; 6 hours at setting 3) with this official CAIRE accessory. - High Capacity Lithium-Ion – 16-cell battery with 13,400 mAh capacity, doubling the life of the standard 8-cell battery. - Fast Recharge – Fully recharges in about 6 hours using AC/DC power or the optional desktop charger. - Travel Ready & FAA Approved – Safe for in-flight use. Lightweight design keeps the device at only 6 lbs (2.7 kg) with this battery installed. - Reliable & Durable – Designed for 300+ charge cycles, with built-in LED charge gauge and TEST button for quick status checks. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07ZQS6ZJH | | Antenna Location | Camera, Remote Control Vehicle | | Battery Capacity | 16 Volts | | Battery Cell Type | Lithium Ion | | Battery Weight | 964 Grams | | Best Sellers Rank | #391,959 in Health & Household ( See Top 100 in Health & Household ) #1,885 in Coin & Button Cell Batteries | | Brand | FERGRELM H | | Customer Reviews | 4.6 4.6 out of 5 stars (108) | | Item Dimensions | 5.51 x 6.69 x 9.84 inches | | Manufacturer | Caire | | Model Name | Comfort | | Model Number | BT035 | | Number of Batteries | 1 Lithium Ion batteries required. | | Reusability | Rechargeable | | UPC | 019321934505 | | Unit Count | 1.00 Count | | Voltage | 1.5 Volts | | Warranty Description | 1 Year | ## Product Details - **Battery Capacity:** 16 Volts - **Battery Cell Composition:** Lithium Ion - **Brand:** FERGRELM H - **Number of Batteries:** 1 Lithium Ion batteries required. - **Recommended Uses For Product:** Camera, Remote Control Vehicle ## Images ![- Freestyle Comfort 16 Cell Battery - Image 1](https://m.media-amazon.com/images/I/31qMQLDkymL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Just what I needed , more time between the charging plug ! *by D***P on July 9, 2023* This 16 cell POC battery is just what I needed , the stock battery works just fine but needed more time between recharging. I ordered the battery , got here faster than expected. Swapped out the old battery and replaced it with the new battery and about six hours later was fully charged. It also fit the carrier , just unzip the expansion part of the carrier, the whole thing is about an 1 1/2 inches taller . Now I can go to the doctor appointment without dragging along the 110 AC charger . If you’re on O2 24/7 this will get you out in the world a little longer without fear of a low battery . ### ⭐⭐⭐⭐⭐ Good Heavy *by L***N on June 6, 2025* Be prepared for a heavier load with this longer life battery! I purchased a backpack concentrator carrier due to the increased weight! The battery is great! Easier to relax when out, not concerned about battery life! ### ⭐⭐⭐⭐⭐ HEAVY *by S***! on April 17, 2024* My only complaint is how heavy this is. Yes, no question that it lasts lots longer than the smaller version. I can shop all day without worrying that I might run out of battery. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/188966521-freestyle-comfort-16-cell-battery](https://www.desertcart.be/products/188966521-freestyle-comfort-16-cell-battery) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-06-25*