Photo from the manufacturer
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The B500K is an expansion battery: it connects with a dedicated cable to a BLUETTI power station - Apex 300, B300K, AC300, AC200MAX, AC200L, AC500 or another B500K - and extends its runtime without a second inverter. The cable to use varies with the pairing: the one included in the box depends on the kit ordered, and for the AC500 or B300S a different, optional cable is needed. It's the largest expansion battery among those that connect to these power stations: useful for anyone who wants to extend a multi-day power outage or put together a small storage system for off-grid use by stacking multiple units.
The enclosure's protection rating is designed for an enclosed, dry environment, not for staying outdoors on a balcony or in an unsheltered storage space. When two or more are connected together they need to be secured to the wall with metal brackets, not simply stacked.
It makes sense for anyone who already owns one of the compatible power stations and wants more stored energy for the home or for days off-grid, not for anyone looking for a standalone battery: on its own, without a power station connected, the B500K powers nothing.
official manufacturer list price — on nominal capacity
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 52 × 32.7 × 30.9 cm (20.5 × 12.9 × 12.1 in) | manufacturer website |
| Weight | 45.0 kg (99.2 lb) | manufacturer website |
| Compatible models | AC200L, AC200MAX, AC300, AC500, Apex 300, B300K | Declared by the brand |
| Nominal capacity | 5.12 kWh | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Rated cycles | 4000 cicli | Declared by the brand |
| Capacity at end of cycle life | 80 % | Declared by the brand |
| Warranty | 4 anni | Declared by the brand |
| Ingress protection | IP20 | Declared by the brand |
| Official list price | 2399 € | Declared by the brand |
| Usable capacity | — | Not declared |
| Depth of discharge | — | Not declared |
| Cell supplier | — | Not declared |
| Expandable | — | Not declared |
| Maximum expanded capacity | — | Not declared |
| Continuous output | — | Not declared |
| Peak output | — | Not declared |
| Peak duration | — | Not declared |
| AC outlets | — | Not declared |
| Fastest USB-C | — | Not declared |
| Maximum charge power | — | Not declared |
| 0–80% charge time | — | Not declared |
| Maximum solar input | — | Not declared |
| Backup power | — | Not declared |
| Switchover time | — | Not declared |
| Guaranteed throughput | — | Not declared |
| Guaranteed remaining capacity | — | Not declared |
| Round-trip efficiency | — | Not declared |
| Standby consumption | — | Not declared |
| Mounting | — | Not declared |
| Minimum temperature | — | Not declared |
| Maximum temperature | — | Not declared |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Wheels and handle | — | Not declared |
| Works without internet | — | Not declared |
| Local control | — | Not declared |
| Open protocols | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| App required for setup | — | Not declared |
| Declared standards | — | Not declared |
The rest of the data comes from one page on the manufacturer's site, cited row by row in the table above.
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
Chosen by the declared use tier and footprint, not by price: we don't publish prices.
