# FOSSiBOT FB3840 3840Wh Portable Power Station Battery

**URL:** https://aio.lv/en/product--fossibot-fb3840--12585756
**Data updated:** 2026-07-19 04:07 (EEST)
**Category:** Other goods
**Manufacturer:** FOSSiBOT
**Manufacturer code:** FB3840
**EAN:** 6942580504971
**Warranty:** 1 Year
**Availability:** Available for order
**Price:** 1 261.99 €
**Prices and availability valid until:** 2026-10-25 23:59
**Price without VAT (21%):** 1 042.97 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--fossibot-fb3840--12585756

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.10.2026 | free |
| Pickup points | 14.10.2026 | 1.99 EUR |
| Courier delivery to door | 14.10.2026 | 4.99 EUR |

## Summary 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.

## Long 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.

## 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 09.10.2026 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. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12585756/68957086_large.webp