fossibot · FB3840
Expansion battery – 3840 Wh
For the F3600 Pro only, up to two units.
A CampOFF alternative recommended on its technical specifications – we have not tested it in person. According to the manufacturer's data sheet it fits this performance class.
€1,199.00EU reference price
Last price check: 29 August 2026
The purchase does not happen on CampOFF. The button opens the current product page of the partner selling it.
Purchase links go live once each partner programme is approved, brand by brand. Until then this page is information only.
Any other questions?
For order or technical questions, the customer service of the partner selling the product can help.
Technical data
- Capacity (Wh)
- 3840 Wh
- Weight
- 37.8 kg
What is it for?
It supplies 230 V and USB without mains power: for a fridge, a laptop, a router, lighting and smaller kitchen devices. At home during a blackout it bridges the loads that matter most.
Who is it for?
Included in these bundles
Alternatives
M6 600W
600 W / 493 Wh portable power station
The smallest step worth taking seriously: laptop, phone, lighting and a small fridge for a short trip.
€307.90EU reference price
Last price check: 23 August 2026
M9 1200W
1200 W / 806 Wh portable power station
For a weekend of camping or a road trip: a fridge plus laptops and phones through a day, with 300 W of solar recharge.
€455.90EU reference price
Last price check: 23 August 2026
M9 1800W
1800 W / 1008 Wh portable power station
The same size with more peak power: a kettle and a coffee machine will start from it.
€525.90EU reference price
Last price check: 23 August 2026
Reviews
We publish our own reviews when we have something to say — we do not collect stars from elsewhere.
Commonly used together
Not sure how big a system you need?
Tell us what you are taking and how many days you spend off-grid. We will tell you how much storage and how much solar is enough — and when a smaller system already covers it.
⚡ Work out what system I needQuick facts and common questions
Expansion battery – 3840 Wh — Capacity (Wh): 3840 Wh, Weight: 37.8 kg. For the F3600 Pro only, up to two units.
- Capacity (Wh): 3840 Wh
- Weight: 37.8 kg
Frequently asked questions
Where can it be bought?
The purchase does not happen on CampOFF but in the webshop of the partner selling the product. The shop page shows the price in EUR; we only state the last verified EU reference price.