Fossibot FB3840 Expansion Battery

1 690.00 EUR (Net: 1 330.71 EUR)

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Fossibot FB3840 Expansion Battery

Name: Fossibot FB3840 Expansion Battery
Brand: Fossibot
Price: 1690 EUR
Availability: InStock

5 year warranty

In the box

In stock

0% VAT for EU businesses (registration needed)

1 690.00 EUR (Net: 1 330.71 EUR)

Brand:

Fossibot

Model name:

FB3840

Weight:

37 800 g

Capacity:

3840 Wh

Battery chemistry:

LiFePO4 Battery with 6500+ Cycles

Additional features:

Connect with the Fossibot F3600 Pro seamlessly to extend capacity to 7680 Wh or 11520 Wh

Solar Input: 200 W Max.

Smart LCD display

USB-C and USB-A output

User manual:

Fossibot FB3840 user manual

Compatibility:

Fossibot F3600 Pro Portable Power Station

Expected delivery :

30/09/2026

Points earned after purchase: 16.90 EUR

Payment methods

Bank transfer

Credit/Debit Card

PayPal Payment

Buy Now Pay Later for Businesses (15 days)

Shipping methods

GLS delivery

Raben pallet delivery

Pick-up in Pomáz (Hungary)

The Fossibot FB3840 is a high-capacity 3840 Wh LiFePO₄ expansion battery designed to extend the runtime of your Fossibot F3600 Pro power station. It features a smart Battery Management System (BMS) for reliable, long-lasting performance with over 6500 life cycles. You can recharge it via a 200 W solar input or through compatible charging sources, making it ideal for off-grid use. Built-in USB-C (100 W) and USB-A (18 W) outputs let you power laptops, phones and other devices directly. With its robust safety profile and expandable capacity, it’s perfect for camping, home backup, or mobile energy needs.

Details

Battery information

Capacity: 3840 Wh (Expandable to 11520 Wh)

Type: LiFePO4 (Lithium Iron Phosphate)

Life Cycles: 6500+ Cycles to 50% Original Capacity

Management System: MPPT Charge Controller, BMS

Output

Inverter Type: Pure Sine Wave

AC Outlets: 3 x AC, Rated Power: 3600 W (7200 W Peak)

USB-C Ports: 3 x PD20W, 1 x PD100W

USB-A Ports: 2 x QC3.0 18W

Cigarette Lighter: 1 x 12V/10A

XT-60 Outlet: 1 x 12V/25A

DC5521 (5.5mm Outlet): 2 x 12V/3A

Input

AC Input: 2200 W Max.

Extended Battery Input: Extra Battery Port × 2

Solar Input (XT90 to MC4): 2000W Max. (12–160 V)

AC + Solar Input: 4200W Max.

Generator Input: 1100W Max.

Car Charger Input: 12/24V, 10A Max

Smart control

Connectivity: Bluetooth, Wi-Fi

App Control: Yes

General information

Scalability: Expandable with up to 2 × FB3840

Simultaneous Recharge & Discharge: Yes

Dimensions (L×W×H): 60,9 × 32,1 × 47,55 cm

Weight: 42 kg

Operating Temperature: 0℃-40℃

Storage Temperature: 0℃-40℃

Certification: FCC, CE, PSE, RoHS, UN38.3, MSDS

Data

Website:

https://www.fossibot.com/

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Precaution

Be careful!

Li-Ion batteries can be dangerous if used incorrectly.
Only use industrial battery cells if you have sufficient expertise and training.
Industrial battery cells may only be used according to their intended purpose.
When building a battery pack, the use of a battery management system (BMS) is mandatory.
Short circuit or improper use may cause fire or explosion.
Pay particular attention to polarity when charging.
Never short-circuit the battery.
Never disassemble or damage the battery.
Never use the battery cell in vapes, e-cigarettes or in similar applications.
If the battery is deformed or damaged in any way, dispose of it at a suitable collection point.
Never immerse the battery in water.
Avoid excessive physical vibration and mechanical damage.
Never dispose of the battery in a fire.
The battery must be kept out of the reach of children.
Never use a modified or damaged charger.
Do not leave the battery in the charger for more than 12 hours.
Store the battery in a cool, dry and well-ventilated place.
Batteries must always be disposed of in accordance with local regulations.
Do not solder on the cells.

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