Bluetti B300K Expansion Battery | 2,764.8Wh
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The Owner's Insights on the BLUETTI B300K
The B300K is the battery you bolt onto a station you already own. It's 2,764.8Wh of LiFePO4, and apart from one small USB-A socket it has no outputs of its own. Your station does the inverting; this just holds the power.
Check the pairing before you order. It suits the Apex 300, AC200L, AC200PL, AC300 and AC500, and you can mix it with B300 and B300S packs you already have. If your station isn't on that list, ring us rather than hoping.
Two practical notes. Pick the variant that matches your station, because the Apex 300 version ships with the short CA90 cable and the other version ships with the lead for the AC-series. And at 29.5kg you'll want to decide where it sits before it arrives, because it's a two-hand lift and it isn't going anywhere afterwards.
What Customers Say About the BLUETTI B300K
Owners of this exact battery keep mentioning how little there is to it. Setup is described as simple, with the station and the app detecting the new battery straight away rather than needing a firmware fight.
The other recurring theme is why people buy a second one. Owners running solar talk about making the most of the sunny days and then having something in reserve for the cloudy ones, which is exactly what the extra storage is for.
Why You'll Love the BLUETTI B300K
- 2,764.8Wh of extra storage. Roughly doubles an Apex 300, or holds your camp fridge for two days on its own.
- 6,000+ cycles to 80%. Charge it flat and full every week and you're still going in twenty years.
- Detected automatically. Plug it in with the supplied lead and your station and app pick it up.
- Two expansion ports. Chain another pack off it at up to 58.4V and 90A as your setup grows.
- 60A charge, 70A discharge. It keeps up with a big station rather than throttling it.
- Nothing much to break. Cells, a management board and a socket, so there's no inverter or screen to fail.
Why You Should Consider a BLUETTI Expansion Battery
BLUETTI is one of the biggest names in portable power worldwide, and the B300K is the pack that keeps their stations useful as your needs grow. It carries a 4-year warranty with stock and support here in Australia, so a claim is a phone call rather than an overseas ticket queue. See the rest of the BLUETTI range.
BLUETTI B300K Specifications
| Capacity | 2,764.8Wh (51.2V, 54Ah) |
| Battery chemistry | LiFePO4 |
| Cycle life | 6,000+ cycles to 80% |
| Compatibility | Apex 300, AC200L, AC200PL, AC300, AC500 (mixes with B300, B300S) |
| USB-A output | 1 x 12W (5V/2.4A) |
| Charging current | 60A max |
| Discharging current | 70A max |
| Expansion ports | 2 x 58.4V DC max, 90A max |
| Charge temperature | 0 to 40°C |
| Discharge temperature | -20 to 40°C |
| Working humidity | 5% to 95% RH |
| Weight | 29.5kg |
| Dimensions | 525 x 327 x 209mm |
| Warranty | 4 years |
| Model | B300K |
Which power stations does the BLUETTI B300K fit?
It pairs with the Apex 300, AC200L, AC200PL, AC300 and AC500, and it stacks alongside B300 and B300S packs if you already own those. We stock two of those stations: the Apex 300 and the AC200PL. If your station came from somewhere else, check that list before you order, because a battery that doesn't fit your unit is dead money.
Which B300K variant do you need?
The battery is the same either way; the lead in the box is what changes. The Apex 300 variant ships with the short CA90 cable, and the other variant ships with the lead that suits the AC-series stations. Pick the one matching your station from the dropdown on this page and the right cable comes with it.
How much longer will the B300K run your gear?
On its own, 2,764.8Wh holds a 60L camp fridge drawing about 45W for a bit over two days. Add it to an Apex 300 and you're carrying about 5,500Wh, which turns an overnight blackout into a comfortable few days with the fridge, the freezer and your modem all running.
BLUETTI B300K price in Australia
The price on this page includes delivery to your door anywhere in Australia. Expansion batteries carry the same 100 Day Free Returns as our power stations, so if you order the wrong variant, send it back.
What's Included
- BLUETTI B300K Expansion Battery
- Battery expansion cable for your chosen variant
- User manual
What's Not Included
- A power station (this is a battery, not a generator)
- Solar panels or a solar cable
- Trolley for moving it about
The in-the-box list above is the manufacturer's own packing list. The B300K needs a compatible station such as the Apex 300 or AC200PL to do anything, and folding panels if you want to refill it off-grid.
Not Sure Which Expansion Battery Suits You?
The B300K suits you if you already run a compatible BLUETTI station and you keep hitting empty before the trip or the outage is over. It's the wrong pick if you don't own one of the listed stations, or if you were hoping for something you can carry on your own, because 29.5kg stays where you put it. Every power station from True Gear comes with 100 Day Free Returns, and the B300K carries a 4-year BLUETTI warranty. Not sure your station takes it? Call the store on 03 7056 6732 and you'll get a straight answer before you spend the money.
BLUETTI B300K Manual
Download the BLUETTI B300K user manual for full technical details and setup instructions.
