BLUETTI B500K2 5120Wh Expansion Battery

This 5.12kWh BLUETTI expansion battery provides over 4,000 life cycles and up to 10 years of reliable energy storage. Expandable to 100kWh, it supports home and small-business backup, works with multiple BLUETTI systems, and features a durable shock-resistant design with flexible wall-mounted or trolley installation.

Availability:
In stock
SKU:
B500K2
Vendor:
Bluetti

Quantity

£1,799.00

£2,499.00 28% OFF

5 in stock

BLUETTI B500K2 5120Wh Expansion Battery

£1,799.00

£2,499.00 28% OFF

Bluetti B500K2 Expansion Battery 5120Wh with 90° Cable

5.12 kWh, Lasts Up to 10 Years: Supplies reliable energy for years with over 4,000 cycles.
Scalable to 100 kWh: Easily expands your setup for partial, whole-home, or even small business backup.
Universal BLUETTI Compatibility: Works seamlessly with Apex 300, AC300, AC500, AC200L, AC200MAX, and upcoming models.
Part of a Smarter Power System: Pairs with SolarX 4K, Hub D1, and more for clean, connected energy.
More Durable & Safe: Wireless internal frame makes it resilient to real-world knocks and shocks.
Wall or Trolley Setup: Mount to save space or move with ease for flexible, convenient use.

Battery Info

Capacity 5,120Wh
Type LiFePO₄ (Lithium Iron Phosphate)
CompatibilityAC200L, AC200MAX, AC300,AC500, Apex300, B300K
Life Cycles 4,000+ cycle to 80% original capacity

Charging & Discharging

Charging Temperature 0°C to 40°C / 32°F to 104°F
Discharging Temperature -20°C to 40°C / -4°F to 104°F
Storage TemperatureUp to 1 month: -20°C to 40°C / -4°F to 104°FUp to 6 months: -20°C to 25°C / -4°F to 77°F
Working Humidity 5% to 95%RH
Charging Current 65A Max.
Discharging Current 70A Max.
2 × Expansion Port 58.4VDC Max., 90A Max.

General

Weight 45 kg / 99.21 lbs
Dimensions (L x W x D) 520 × 327 × 308.5 mm / 20.47 × 12.87 × 12.15 in
Warranty 4 Years

Why Choose BLUETTI B500K?

Extend Your Backup Time

From outage protection to camping trip and off-grid working, the B500K keeps you powered for longer — more freedom and peace of mind.

Up to 100 kWh Massive Expansion

Increase your energy storage as needed, from 5.12 kWh to over 100 kWh*. The B500K battery is compatible with various BLUETTI power stations for easy, cost-effective upgrades. *Note：Achieved with 3 Apex 300 + 18 B500K units

Adapt to All Your Needs

The B500K either expands your BLUETTI power stations, or serves as a high-capacity power bank with ecosystem components, delivering 700 W DC output for your devices. Note: P090D to P150D cable is required for connecting with AC500 and sold separately.

Made It Safe, Reliable, and Long-lasting

The B500K adopts advanced LiFePO₄ batteries for over a decade of safe use. Its third-gen wireless internal design and efficient cooling fan ensure stable performance, even in challenging conditions.

Fixed or Movable Setup

Secure the B500K to the wall or rack of your home or RV using its mounting holes, or attach it to the Foldable Trolley 2* for a mobile power supply.

*Note：Fordable Trolley 2 sold separately.

Comparison

What's Included

1 x B500K
1 x Short Battery Expension Cable (CA90)
1 x User Manual

Free Delivery

Free Delivery for mainland UK

PLEASE NOTE:

Free shipping is by dpd and only for addresses on mainland UK.

All BT, Northern Ireland, Northern Scotland, Highlands BT / PH / IV / KW / AB / IM / Isles postcodes will incur an additional £20.00 charge for delivery.

Additional Postage Payable for Shipping to

Northern Ireland
Highlands
Northern Scotland
Scottish Isles
Isle of Man
Orkney
Shetland

Warranty

Covered with official 4 Years Warranty

Warranty Period

BLUETTI warrants that the product will be free from defect in workmanship and material to the original consumer purchaser.
The warranty period starts on the date of purchase by the original consumer purchaser,
For the product of portable power station, the warranty period varies from 24 months to 72 months.
For the product of home backup system, the warranty period varies from 48 months to 60 months.
For the product of solar panel and accessories as cable, charger etc, 12 months is provided for the warranty service.
No warranty for gifts product and Warranty period may vary by country subject to local laws and regulations.

Warranty Statement

Any defects in material, workmanship of your product will be covered after you provide any valid proof of purchase and information including but not limited to:
A purchased order number made through BLUETTI official stores.
Sales invoice or order confirmation email that clearly shows the description of the product, its price, and sales channel.

Note: The limited warranty is restricted to the country of purchase. The warranty will be invalid on the items once they are taken or shipped to other countries.

Exclusions of Warranty

Misused, abused, damaged by accident or damaged due to force majeure (e.g. lightning strikes, tornadoes, hurricanes, etc.);
Unauthorised modification, repair, dis-assembly or operation not in accordance with the official instructions or manuals;
Use for special application other than normal consumer use;
Any defect or damage caused by exposure to excessive heat, cold, liquids or other external causes;
Invalid proof of purchase;

Warranty period expired

The battery model on the warranty certificate does not match the actual item
Product wear and tear through the usage of time.