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header-product FOSSiBOT FB3840 3840Wh Portable Power Station Battery
1,261.99 €

FOSSiBOT FB3840 3840Wh Portable Power Station Battery

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Short description

The FOSSiBOT FB3840 is a high-capacity 3840Wh portable battery designed for reliable energy storage. This unit provides a robust power solution for off-grid applications, emergency backup, and outdoor activities. Engineered for efficiency and durability, it ensures a steady power supply for various electronic devices and appliances, making it an essential tool for energy independence in diverse environments.
Available for order: 15 pcs.
Warranty: 1 Year
SKU: 12585756
Manufacturer: FOSSiBOT
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Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

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Customer service center
2b. Kengaraga str., Riga, Latvia, LV-1063
08.10.2026 {{selectedOffer.officeDeliveryString}}
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Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!
13.10.2026 {{selectedOffer.courierDeliveryString}}
From 4.99 €
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Unisend LV / Venipak Pickup LV / Venipak Locker LV / DPD Paku skapis / Omniva LV / Latvijas Pasts pakomāts / Latvijas Pasts nodaļa
13.10.2026 {{selectedOffer.parcelStationDeliveryString}}
From 1.99 €
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3 mth. х 420.66 €

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All payment Methods:
Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment, Leasing for legal entities
36 months installment: from 35.06 euros per month
Leasing for legal entities: from 43.92 euros per month
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Product information

Description

The FOSSiBOT FB3840 is a high-capacity 3840Wh expansion battery engineered specifically to integrate with the FOSSiBOT F3600 Pro power station. Utilizing advanced LiFePO4 battery chemistry, this unit offers exceptional longevity with over 6,500 charge cycles while maintaining 50% of its original capacity. It serves as a versatile energy storage solution, allowing users to scale their system capacity up to 11,520Wh by connecting two additional units. Beyond its role as an expansion module, it functions as an independent DC power source, featuring a variety of output ports for mobile devices and appliances.

Advantages

The primary benefit of the FOSSiBOT FB3840 is its modular scalability, which provides users with the flexibility to tailor their power reserves to specific needs, whether for short camping trips or extended off-grid living. The integration of LiFePO4 technology ensures a high level of safety and durability, making it a reliable long-term investment. Furthermore, the inclusion of multiple DC output ports allows for direct powering of electronics without needing an inverter, which increases overall energy efficiency. The built-in Battery Management System (BMS) provides comprehensive protection against electrical faults, ensuring safe operation in diverse environments.

Suitable for

  • Extending runtime for FOSSiBOT F3600 Pro power stations
  • Off-grid living and cabin power backup
  • Powering RV and campervan appliances
  • Emergency home power supply during outages
  • Mobile work setups requiring high-capacity DC power

This battery may not be suitable for users who require a standalone AC power source, as it does not feature an integrated AC inverter and must be connected to the F3600 Pro station to power 230V appliances. Additionally, due to its weight of 42 kg, it may not be the ideal choice for users who prioritize extreme portability or frequent manual transport over long distances.

Key specifications

  • Capacity: 3840Wh
  • Battery Chemistry: LiFePO4
  • Cycle Life: Over 6,500 cycles to 50% capacity
  • Compatibility: FOSSiBOT F3600 Pro
  • DC Outputs: 1x 100W USB-C, 3x 20W USB-C, 2x 18W USB-A, 12V/10A cigarette lighter, 12V/25A XT-60, 2x 12V/3A DC5521
  • Dimensions: 60.9 x 32.1 x 47.5 cm
  • Weight: 42 kg

How to use

To use the FOSSiBOT FB3840 as an expansion battery, connect it to the FOSSiBOT F3600 Pro using the provided parallel connection cable. Once connected, the power station will automatically recognize the additional capacity, and the total energy reserve will be reflected on the LCD display. For independent DC use, simply activate the DC output button on the unit and plug your devices directly into the appropriate USB or DC ports. The LCD screen provides real-time monitoring of the battery status and output parameters.

What to consider before purchase

  • Ensure compatibility with your existing FOSSiBOT F3600 Pro unit
  • Verify that the weight of 42 kg is manageable for your intended storage location
  • Check that your devices are compatible with the available DC output ports
  • Confirm that your operating environment remains within the 0°C to 40°C temperature range
Usage recommendations: To maximize the lifespan of your FOSSiBOT FB3840, store it in a cool, dry place and avoid exposing it to extreme temperatures. If the unit will not be used for an extended period, ensure it is charged to approximately 50-80% and perform a full charge-discharge cycle every few months to maintain battery health.

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Product comparison

The FOSSiBOT FB3840 3840Wh portable power station is compared against the FOSSiBOT FBP1200-B and alternative models from other brands: EcoFlow DELTA 3 Max Plus, Bluetti AC70P, and Bluetti Premium200V2. All these units are engineered for off-grid energy storage, emergency backup, and outdoor or remote use. The primary differences among them lie in battery capacity and output power, which directly determine how long connected appliances can run and which use cases each device serves best.

⚙️ The table below compares the key specifications, including battery capacity, intended purpose, and design characteristics.

ParameterFOSSiBOT FB3840FOSSiBOT FBP1200-BEcoFlow DELTA 3 Max PlusBluetti AC70PBluetti Premium200V2Practical Conclusion
Device TypePortable Power StationPortable Power StationPortable Power StationPortable Power StationPortable Power StationAll options provide off-grid power, but they differ significantly in energy scale.
Battery Capacity3840 Wh1985 Wh2048 Wh864 Wh2073 WhThe FOSSiBOT FB3840 offers the largest capacity for extended autonomy, whereas the Bluetti AC70P prioritizes portability.
Intended PurposeEnergy independence, off-grid backup, heavy-duty useField use, emergency backup, outdoor activitiesEmergency backup, camping, running demanding appliancesCamping, travel, mobile electronicsEmergency backup, camping, consistent energy supplyLarger stations suit extended outages, while smaller units are more convenient for frequent transport.

◎ The table below evaluates which product is best suited for different user needs and application scenarios.

Use CaseRecommended ProductWhy
Extended home or off-grid backup powerFOSSiBOT FB3840 3840WhMaximum battery capacity allows powering heavy appliances for long periods and ensures high energy independence.
Mobile travel and light outdoor tripsBluetti AC70P Portable Power Station 1000W 864Wh LiFePO4Compact 864 Wh capacity and lighter build make it ideal for short trips and powering essential personal devices.
Versatile outdoor recreation and mid-range backupEcoFlow DELTA 3 Max Plus or Bluetti Premium200V2Provide a balanced capacity around 2000 Wh for standard emergency and recreational power requirements.

The FOSSiBOT FB3840 3840Wh portable power station stands out with its exceptionally high 3840 Wh capacity, making it the superior choice for users who need prolonged off-grid autonomy and reliable power for demanding appliances. If you require a much more lightweight and compact unit for travel, the Bluetti AC70P is more suitable, while the FOSSiBOT FBP1200-B, EcoFlow DELTA 3 Max Plus, and Bluetti Premium200V2 serve as solid mid-range alternatives for standard backup scenarios.

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Customer reviews

Customer questions

FAQ

How much does the FOSSiBOT FB3840 3840Wh Portable Battery cost, and is it available for purchase?

The price is 1,261.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 15 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 08.10.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

Can FOSSiBOT FB3840 3840Wh Portable Battery be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. We work with leading banks and leasing companies in Latvia, allowing you to make your purchase on convenient terms — with a minimal down payment and a repayment period from 3 to 36 months. You can apply for credit or installments for the FOSSiBOT FB3840 3840Wh Portable Battery online, and the application process is as simple as possible:
  • Select the product on the website and add it to your cart;
  • When placing your order, choose the payment method “Installments”;
  • Fill in the required details for the lending partner;
  • Receive a decision within a few minutes.
For more information about available payment options, interest-free installment terms, and credit conditions in Latvia, please visit the Payment page.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All FOSSiBOT products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized FOSSiBOT service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.
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14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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