BLUETTI · Expansion Batteries
BLUETTI B500K Expansion Battery | 5,120Wh - B500K for Apex 300 | 5,120Wh
$2,699.00
$2,999.00Save $300.00 (10%)
at Bluetti Canada
Price checked Oct 25, 2026
Key specs
- Rated battery capacity
- 5120 Wh
Example runtimes
- Refrigeratorabout 77 hours
- Freezerabout 4 days
- Wi-Fi router and modemabout 6 days
Assumes 85% inverter efficiency and a 20% reserve (rated Wh × 0.68). Your appliances will differ; see the sizing guide.
Key specs
- Rated battery capacity
- 5120 Wh
Example runtimes
- Refrigeratorabout 77 hours
- Freezerabout 4 days
- Wi-Fi router and modemabout 6 days
Assumes 85% inverter efficiency and a 20% reserve (rated Wh × 0.68). Your appliances will differ; see the sizing guide.
Price tracked since Oct 25
Is this a good deal?
- The current price took effect within the last day.
Based on prices we’ve recorded from Bluetti Canada since October 2026, refreshed several times daily.
About this product
The BLUETTI B500K is a high-capacity expansion battery designed to extend the energy storage of compatible BLUETTI power stations. With a substantial 5,120Wh capacity, it pairs with the AC200MAX, AC300, AC500, AC200L, and Apex 300, and the system can scale up to 100kWh when multiple units are connected. This makes it a practical choice for home backup power, cabin setups, and off-grid living where sustained energy supply is a priority. As a dedicated expansion battery rather than a standalone unit, the B500K is built specifically to integrate with the supported BLUETTI ecosystem, allowing users to incrementally grow their storage capacity as their needs evolve. Its expandability and compatibility across several popular BLUETTI models give it versatility for a range of residential and remote power applications.
- Category
- Expansion Batteries
- Brand
- BLUETTI
- Type
- Expansion Battery
What people are saying
Reviewers consistently praise the BLUETTI B500K for its exceptional value per watt-hour, noting it delivers roughly 85% more capacity than the previous B300K at a lower cost per watt-hour, making it one of the most cost-effective modular storage options available. The plug-and-play integration with compatible BLUETTI stations (including the Apex 300, AC300, and AC200L) and the long-lasting LiFePO4 chemistry rated for 4,000-plus cycles are frequently highlighted as standout strengths. Real-world testing confirms the unit delivers close to its rated capacity. The most common and recurring criticism is the substantial weight of approximately 45 kg (99 lbs), which reviewers note makes repositioning difficult and practically requires a trolley or a second person. Some users also flag occasional compatibility or firmware recognition issues when pairing with certain host stations, and the high upfront price is cited as a barrier, even if the per-watt-hour economics are favorable.
Specifications
- Rated battery capacity
- 5120 Wh
- Expandable
- Yes
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