
FOSSiBOT FB3840 Expansion Battery - 3840Wh LFP (For FOSSiBOT F3600 Pro)
Why us?
- Free shipping throughout Denmark. No additional fees. Ever.
- 14 day easy return right. If you are not satisfied with your product, we will take it back without question.
- Excellent service. We pride ourselves on the best service anywhere.
- Your satisfaction guaranteed. We select our products with a focus on quality, and we know you'll love them. But if there's ever something wrong, we'll fix it.
- The largest provider of Campervan Modules in Denmark.
FOSSiBOT FB3840 Smart battery pack
- With a 100W USB-C port and an 18W USB-A port, the FB3840 can be used as a portable power station.
- The FB3840 expansion battery enables fast recharging via solar energy with a maximum power of 200 W.
Compatible with FOSSiBOT F3600 Pro
Each FB3840 unit delivers 3840 Wh. Connecting one unit doubles the capacity to 7680 Wh, while two units triple it to 11,520 Wh. This ensures several days of power for essential appliances when used with the FOSSiBOT F3600 Pro.
Solar charging or AC charging for the expansion battery
The FB3840 expansion battery can be charged with a 200W solar panel or via the car cigarette lighter socket. When connected to the FOSSiBOT F3600 Pro, it can use all of the F3600 Pro's charging methods.


Portable power - anytime
FOSSiBOT FB3840 gives you portable power, no matter when or where. When you need it, it's ready to deliver.
Versatile DC output power
The FB3840 is equipped with an 18W USB-A and a 100W USB-C output, so you can power your smartphones, laptops, fans, USB LED lights, and more.
Informative screen display
- XT60 Input Port
- Expansion Battery
- High/Low-Temperature Protection
- Fast Charge Indicator
- Battery Percentage
- Input Total Power
- USB Output
- Remaining Use/Charge Time
- Output Total Power
- PD3.0 Output
Power for longer – save on your electricity bill
Together with the FOSSiBOT F3600 Pro, this companion helps you significantly reduce your electricity bill and provides power for longer for your needs.

Safe LiFePO4 battery with 6,500+ life cycles
The FB3840 expansion battery uses the same EV-rated LiFePO4 battery with BMS protection. A safe and extra durable battery with a lifespan of over 10 years.
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