BLUETTI B300K, 2764.8Wh LiFePO4 Battery Pack for Portable Power Station Apex 300 Only, Extra Battery for Home, Emergency, Road Trip

My Review of the BLUETTI B500K Expansion Battery. The BLUETTI B500K is a solidly built, no-frills 5,120Wh (5.12 kWh) LiFePO4 expansion battery—well-made and reliable. I’ve found BLUETTI consistently outperforms more hyped brands in the portable power space. I’ve owned an AC300 for nearly 5 years, and their customer support has been exceptional—friendly, knowledgeable (the reps often seem like engineers), and quick to resolve issues. BLUETTI’s edge comes from using LiFePO4 cells: over 4,000 cycles to 80% capacity means 10+ years of daily use, with better safety (no thermal runaway risk) than standard lithium-ion alternatives. At (promo price, it delivers excellent value at about $380 per kWh with the promo pricing that comes up often, it’s competitive-with EcoFlow or Anker options, especially factoring in longer life and broad compatibility (AC300, AC200L/MAX, AC500, Apex 300). Stack up to six per unit for massive scaling (up to 100 kWh systems). The hardware stays straightforward, but the BLUETTI app adds real utility: real-time SOC, power input/output, historical charts for solar generation vs. usage, and trends over time. This helps optimize—avoid wasting excess solar when batteries fill, adjust loads to maintain healthy charge levels, or prep better for outages by tracking patterns. It connects via Bluetooth or WiFi/cloud and has improved significantly. Not the lightest (~99 lbs) for moving, but perfect for stationary home backup or off-grid setups tied to my AC300—it doubles capacity seamlessly and powers essentials for days. If you’re in the BLUETTI ecosystem or building expandable storage, the B500K is a smart, cost-effective upgrade. BLUETTI keeps delivering where it matters

An xtra battery , plug and play right out of the box, plugs in to your portable power station to get xtra power, needed to get you through the night until the Sun comes out again, at $0.43 per Wh is an unbeatable price, almost 2800 Wh , cable is 32 inches long total, each connector is 4 inches and cable is 26 inches long, also update the firmware right away, very portable

Bluetti batteries are amazing great life I use them in my trailer during the summer and for emergency power for my house in the winter I love these setups they are amazing and super easy to use.

I recently completed a solar setup with 6 ZOUPW 450W panels, the Bluetti AC500, and 3 B300K batteries, and I honestly couldn't be happier. The system has been performing phenomenally — I’m generating over 2.5kW of clean, reliable solar power, which keeps my essential loads running and charges the battery bank with no problem, even on partially cloudy days. The AC500 is the brains and brawn of the operation — it manages solar input effortlessly and distributes power to the batteries and devices with incredible efficiency. With over 9kWh of battery storage thanks to the 3 B300Ks, I’m confident we can run for extended periods completely off-grid if needed. The app interface, monitoring, and expandability make it feel like something straight out of a sci-fi movie. I haven’t even installed the Bluetti sub panel yet, which will allow me to supplement power directly to the house. Once that’s in place, I’ll be able to run high-demand appliances without even noticing we’re on solar. This system has turned my home into a quiet, self-reliant energy hub — no noisy gas generators, no fuel to store, and virtually no maintenance. If you're considering building a home backup or hybrid solar system, this combo is absolutely worth it. It’s powerful, scalable, and ready for any power outage or energy-conscious lifestyle. 10/10 would recommend!

Works great! It is NOT portable unless your hobby is lifting weights. Its heavy! Slap it in a corner, plug it in, use it, and forget about it.

I bought 2 B300 batteries for my AC200MAX and while the batteries are nice, I can't see them since they face the wall. The B300 battery was made for the AC300 and AC500 which have battery connectors on the right side. The connectors on the AC200MAX are on the left side, and the battery cables are too short to go from the left to the right connectors. So, my batteries have to face the wall. Bluetti, in its lack of thought - does not have a 3-foot "extension cord" to fix the situation (not that I asked but searched the web site). This review only gets 4 stars since the power button is also in (front) back of the B300 so is hard to turn on and I have to press the button (on both) to turn it on. My components are stacked to take up minimal space. The B300 has 4 battery connectors on the right and none on the left. The only way Bluetti gets 5 stars is if they send me the 3-foot extension to make one cord longer or send the full 6-foot battery cable.

Have 3 of these, and they do what they need to. I have 2 other expansion batteries, and an AC200L and an AC200MAX, and use these when we have electrical problems. I get them out about every 6 months and use them to run my refrigerator to drain and recharge everything, they recommend doing this. So, can't say anything about how many times you can recharge them, but they work great when I plug them in. Very happy to have them, as is my neighbor. I put one system at his house at night for his refrigerator and then recharge everything when he runs his gas generator during the day. Don't want to leave generator out at night because it could be stolen. And can charge faster than by panels when are stored when not in use. Helps both of us.

It's a beast and it works. What else to say? Plug and play with compatible Bluetti products.

Ho acquistato diversi prodotti di Bluetti tra i quali AC200MAX, AC300 e B300. AC200Max si è guastato dopo 2 anni. AC300 dopo 1 anno e mezzo. Il servizio clienti ha provveduto alla sostituzione della prima e riparazione del seconda Power station, accollandosi le spese di spedizione. È obbligatorio conservare le scatole originali. I prodotti funzionano adesso in modo eccellente, anche se con un autoconsumo di una certa rilevanza. Per B300 nulla da eccepire. Bisogna vedere se i 3500 cicli di carica-scarica sono reali. È opportuna una DOD (profondità di scarica) non inferiore del 15%.

Love it! It pretty much doubles the battery capacity of our AC 200max. It was extremely easy to hook up and incorporate into the system. We use it as our only power supply for our off-grid cabin and only use a gas generator for charging every other day or a little longer depending on how the sun is.

The item was as expected and so far works good.

Ottimo prodotto grazie arrivato ottime condizioni consegnato in anticipo massima cortesia