BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for scalable home, RV, off-grid solar and backup power systems

BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for home, RV, off-grid solar, and backup power systems

BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for home backup, RV, off-grid solar, and portable power systems

BLUETTI B500K2 modular LiFePO₄ expansion battery pack for high-capacity home, RV, off-grid solar, and backup power systems

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BLUETTI B300K expansion battery for AC500

in Bluetti

$2,999.95 NZD (Including GST)

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Description

BLUETTI B300K Expansion Battery for AC500 | 2,764.8Wh High-Capacity Power Module

More power. More freedom. More of everything your AC500 was built to do.

Meet the BLUETTI B300K — the expansion battery that takes your AC500 from “impressive” to “unstoppable.” Packing a massive 2,764.8Wh LiFePO₄ battery, this scalable power module is engineered to extend your runtime, multiply your capacity, and keep the lights on long after the grid taps out. Whether you’re backing up your entire home, powering an off-grid cabin, or living the van life, the B300K is the muscle behind the mission.

Scale It Your Way — 5kWh, 10kWh, 15kWh & Beyond

One B300K is powerful. Several? That’s a whole-home energy system. Stack multiple modules onto your AC500 and build a setup that runs:

From sudden blackouts to permanent off-grid setups, the B300K adapts to your energy appetite.

Built for the AC500 — Down to the Last Watt

This isn’t a generic add-on. The B300K is purpose-engineered to integrate seamlessly with the AC500, delivering stable, efficient power, longer runtime, and full compatibility with the AC500’s advanced features. Plug in, power up, and expand without limits.

LiFePO₄ Cells That Go the Distance

With 3,500+ life cycles, superior heat resistance, and rock-solid safety, the B300K is built to last for years of daily use. That’s reliability you can count on long after cheaper batteries call it quits.

Solar-Ready & Self-Sufficient

Pair it with the AC500 and unlock high-efficiency solar charging perfect for cabins, RVs, renewable home setups, and slashing your electricity bills. Store more clean energy by day, stay powered all night, and let the sun do the heavy lifting.

Need power on the go? The B300K’s built-in output ports (varies by model) let you charge small devices even without the AC500 connected.

Smart Protection, Built In

An advanced Battery Management System (BMS) stands guard 24/7 with:

Overcharge & over-discharge protection
Real-time temperature monitoring
Overcurrent & short-circuit protection

Wherever you roam, your power stays safe.

Strong. Stackable. Effortless.

Designed to stack, install, and expand with zero hassle, the B300K grows right alongside your needs.

Perfect for: Whole-home backup · RV & van life · Workshops & field ops · Long camping trips · Solar-powered living

Product Overview

Power Expansion for Every Situation

The B300K adapts to your life, whether you’re safeguarding your home during outages or powering an off-grid adventure. Stack multiple B300K batteries, or mix and match with B300, and B300S models for a customized energy solution that ensures you’re never caught without power, no matter where you are.
*Need P150D to P090D cable to connect the AC500.

Great Compatibility for More Possibilities

The B300K seamlessly integrates with AC200L, AC200MAX, AC300, Apex 300 and AC500* power stations, giving you the flexibility to scale your energy setup as your needs grow. Whether you’re prepping for more power at home or gearing up for your next adventure, the B300K has you covered.

* A P090D to P150D cable is required for connecting with AC500 and sold separately.

Built to Protect, Designed to Last

The B300K is designed to excel in safety and reliability. Featuring square LiFePO₄ batteries and cutting-edge AI-BMS technology, together with a robust aluminum casing, advanced wireless components, and efficient cooling fan ensure this battery stands the test of time, giving you a power source you can count on in any situation.

Fast Charging Comes in Handy

When paired with the AC300 or AC500, this battery charges up to 80% in just 45 minutes, so you can get back to what matters without any significant interruption, your work, activities, or emergencies …whether you’re at home or on the go.

A Standalone Power Source, A Standout Performance

The B300K isn’t just an add-on; it’s also a versatile power hub. With a USB-A port, it’s perfect for keeping your essentials like smartphones, tablets, or fans charged, whether you’re ready to make an urgent call or message, eager to share beautiful moments with your friends, or try to stay cool while camping in a tent. Power is always within reach, wherever life takes you.

Tech Specs

B300K

FAQs

Q1: How to claim warranty?

Once you receive your product, please register to claim your warranty on our website.

Q2: Why doesn’t the B300K drain all its power?

The B300K retains a portion of its energy to prevent overdischarging, which helps protect the battery’s lifespan and ensures long-term performance.

Q3: Can I leave the battery uncharged after fully discharging?

No, it’s important to recharge the B300K in time before the SoC drops to 1% to avoid potential damage. Additionally, ensure it’s placed in an environment of at least 10°C (50°F) for at least 12 hours before recharging.

Q4: Which BLUETTI power stations can work with B300K?

B300K is compatible with AC200L, AC200MAX, AC300, and AC500. When connecting to AC500, the P090D to P150D cable is required for connecting with AC500 and sold separately.

Q5: Can I use the B300K alone?

Yes. B300K is a standalone power source with a 12W USB-A port.

Note: The B300K can only be charged by connecting to the AC500/AC300/AC200L/AC200MAX

Q6: Does the B300K support power bank mode?

No.

Q7: How many B300K batteries can l connect with AC300? Can l mix B300K/B300/B300S?

The AC300 supports connecting with up to 4 B300 / B300K using the P090A cable.

Note: The AC300 can mix and match with B300 and B300K. However, it cannot connect B300, B300K, and B300S batteries simultaneously.

Q8: How many B300K batteries can l connect with AC500? Can l mix B300K/B300/B300S ?

The AC500 supports up to 6 B300K. The P150D to P090A cable is required for connecting the AC500 with B300K or B300K with B300S.

The AC500 can mix and match with B300, B300S, and B300K, with up to 6 total battery packs.

Note: For the combo with one AC500 unit, if B300 is included, up to 4 battery packs can be connected; if not, up to 6 packs can be connected.

Q9: How many B300K batteries can l connect with AC200L? Can l mix B300K/B300/B230/B210 ?

The AC200L supports up to 2 B300K for up to 7,577.6Wh capacity using the P090D cable.

Note: AC200L can only mix with B300 and B300K.

Q10: How many B300K batteries can l connect with AC200MAX? Can l mix B300K/B300/B230/B210 ?

AC200MAX supports up to 2 B300K for up to 7577.6Wh capacity using the P090D cable.

Q11: How long does it take to charge the B300K to 80%?

Connecting with AC300 / AC500, you can charge the B300K to 80% in 45 minutes using a 30A charging cable.

Note: For reference ONLY.

Q12: Can one AC200MAX expansion port connect to the B300K and the other to the B230/B210?

Yes, you can

Q13: If the B300K is mixed with other battery packs, can I monitor the status of different packs?

Yes. Connect it to the AC300 / AC500 / AC200L / AC200MAX, and you can control the system via the BLUETTI App at any time, from anywhere.

Q14: Can I use B300K alone as a UPS?

Q15: Can l use solar panels or car cigaretter lighter to charge B300K?

No. The B300K can only be charged by connecting to the AC500 / AC300 / AC200L / AC200MAX.

Q16: Can I use or charge B300K in sub-zero temperatures?

Temperature ranges for B300K are:

Charge: 0 to 40℃ (32 to 104℉);
Discharge: -20 to 40℃ (-4 to 104℉);
Storage: -20 to 40℃ (-4 to 104℉).

Technically, it can power electrical devices under such situations, but please avoid charging it.

Q17: How long can it run my device?

Running time = Battery capacity × DoD × η ÷ Device rated power DoD refers to Depth of Discharge and η is local inverter efficiency. For B300K, both DoD and η are 90%. If you run a 100W light bulb with it, the running time will be:

2,764.8Wh × 90% × 90% ÷ 100W ≈ 22.39hrs

Note: The above data is for reference ONLY.

Q18: Is B300K waterproof?

No. Also, please do NOT store it in a humid environment for a long time.

Q19: Is it possible to replace the built-in battery?

No. If the battery pack is faulty or even dead, please contact BLUETTI Customer Service.

Q20: How to access more tutorial videos for the AC300 / AC500 / AC200MAX / AC200L and B300K combo?

Follow BLUETTI Support on YouTube for more videos.

Q21: Does the B300K have a Power Bank mode?

No.

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