---
product_id: 188966521
title: "Freestyle Comfort 16 Cell Battery"
brand: "fergrelm h"
price: "€ 1073.27"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fergrelm H"
url: https://www.desertcart.fr/products/188966521-freestyle-comfort-16-cell-battery
store_origin: FR
region: France
---

# Up to 16 hours runtime 6-hour fast recharge 13,400 mAh high capacity Freestyle Comfort 16 Cell Battery

**Brand:** fergrelm h
**Price:** € 1073.27
**Availability:** ✅ In Stock

## Summary

> 🔋 Power your freedom—stay charged, stay unstoppable.

## Quick Answers

- **What is this?** Freestyle Comfort 16 Cell Battery by fergrelm h
- **How much does it cost?** € 1073.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/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

- • **Built to Last:** Designed for 300+ charge cycles with an intuitive LED gauge and TEST button for instant power status.
- • **Double the Capacity:** 13,400 mAh lithium-ion battery doubles the life of standard packs for worry-free mobility.
- • **Power That Keeps Up:** Experience up to 16 hours of uninterrupted oxygen support—because your day doesn’t stop early.
- • **Fast & Flexible Charging:** Recharge fully in just 6 hours via AC/DC or optional desktop charger—ready when you are.
- • **Travel-Ready & FAA Approved:** Fly with confidence—lightweight, compact, and approved for in-flight use worldwide.

## Overview

The CAIRE FreeStyle Comfort 16-Cell Battery is a premium lithium-ion power solution offering up to 16 hours of runtime at the lowest setting. With a robust 13,400 mAh capacity, fast 6-hour recharge, and FAA approval for air travel, it ensures reliable, long-lasting oxygen support on the go. Lightweight and durable, it features over 300 charge cycles and an easy-to-read LED charge indicator, making it the ultimate companion for active, health-conscious professionals.

## 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: 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!
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 .

## 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 |
| Batteries | 1 Lithium Ion batteries required. |
| Best Sellers Rank | #382,620 in Health & Household ( See Top 100 in Health & Household ) #1,930 in Coin & Button Cell Batteries |
| Customer Reviews | 4.5 4.5 out of 5 stars (107) |
| Date First Available | December 16, 2019 |
| Item Weight | 2.7 pounds |
| Item model number | BT035 |
| Manufacturer | Caire |
| Product Dimensions | 5.51 x 6.69 x 9.84 inches |

## 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

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐⭐ 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 .

### ⭐⭐⭐⭐⭐ 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.

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**Shop now:** [https://www.desertcart.fr/products/188966521-freestyle-comfort-16-cell-battery](https://www.desertcart.fr/products/188966521-freestyle-comfort-16-cell-battery)

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-31*