Wattstanding
BLUETTI B300K for Apex 300

Product image: BLUETTI

Expansion battery · BLUETTI

BLUETTI B300K for Apex 300

BLUETTI · 2,765 Wh add-on

The short answer

The BLUETTI B300K for Apex 300 adds 2,765 Wh of storage. The listing says it is for Apex 300. BLUETTI lists it at $1,079, about $390 per kWh.

Capacity
2,765 Wh
For
Apex 300
Chemistry
LiFePO4
Weight
65.04 lb
Price seen
$1,079

Good fit if

  • You already own the compatible base unit and need longer runtime
  • You prefer adding storage to adding a second station

Look elsewhere if

  • You do not own the compatible base unit
  • You need more output watts — an expansion battery adds energy, not power
$1,079BLUETTI listed price (base model) · seen 30 Sep 2026
View at BLUETTICheck price on Amazon

Every link opens the product page for this exact model. We may earn a commission; it never changes what we publish. Disclosure

What it adds

An expansion battery adds watt-hours to a compatible power station without adding output: the base unit's inverter still limits how many watts you can run, but you can run them for longer.

Total capacity with this battery
Base unitBase capacityWith this batteryAC output (unchanged)
BLUETTI Elite 300 Portable Power Station3,014 Wh5,779 Wh2,400 W
Wattstanding calculationWattstanding calculation — total capacity = base capacity + expansion capacity. Output watts stay at the base unit's rating.

Fit check before you buy

An expansion battery only works with the units its maker lists.

✓ Required? Check firsti Good to know
  • ✓Compatible base unitApex 300
  • ?Connection cableSome expansion batteries need a specific cable or adapter that may be sold separately.
  • iWeight65.04 lb as stated.

Specifications

Each figure is labelled with where it comes from. Numbered references link to the source list below.

Manufacturer storeRetailer listingWattstanding calculationNot verified

Published specifications

Battery capacity2,765 Wh[S1]Manufacturer store
Listed for use withApex 300[S1]Manufacturer store
Battery chemistryLiFePO4[S1]Manufacturer store
Cycle life6,000 cycles[S1]Manufacturer store
Weight65.04 lb[S1]Manufacturer store
Warranty3+1 Years[S1]Manufacturer store

Wattstanding calculations

Price per kWh$390Wattstanding calculation

Limitations to weigh

  • Specifications are the maker's or seller's; Wattstanding has not tested this product.
  • Compatibility is the seller's statement; confirm it for your exact base unit and version.
  • Prices change; confirm the price and what is included.

Alternatives worth comparing

BLUETTI B300K for AC200L/AC3002,765 Wh; $20 more
Anker SOLIX BP2600 Expansion Battery - 2560Wh LFP (For F2000, F2600) (A1781111-85)2,560 Wh; $79 less
Lion Energy Safari 2,688wH Expansion Battery Pack (XP)2,688 Wh; $220 more
Dabbsson DBS2000B Expandable Battery2,048 Wh; $20 more

Where to buy

Our link opens this exact product page. Prices and stock change; check before you order.

$1,079BLUETTI listed price (base model) · seen 30 Sep 2026
View at BLUETTICheck price on Amazon

Every link opens the product page for this exact model. We may earn a commission; it never changes what we publish. Disclosure

Questions buyers ask

Will the BLUETTI B300K for Apex 300 work with my power station?
The listing says it is for Apex 300. Confirm your exact model and version with the seller.
Where can I buy the BLUETTI B300K for Apex 300?
1 seller list it: BLUETTI.

Sources and verification

  1. BLUETTI — B300K for Apex 300 — product page and specifications Retrieved 30 Sep 2026

Wattstanding has not tested this product hands-on. This reference is compiled from the sources above; our calculations are labelled and show their working. Electrical work belongs to a licensed electrician. Last verified 30 Sep 2026. How we work