External Battery Connection Cable (CA90)

External Battery Connection Cable (CA90)

The short, smart way to grow your BLUETTI system

The CA90 is the purpose-built expansion cable that links your BLUETTI Apex 300 to a B300K or B500K expansion battery and chains additional B300K units together so you can scale your backup power without the clutter. Where older connection cables were long and stiff and left your gear sticking out awkwardly, the CA90 keeps everything tight, tidy, and stacked.

Built for a neat, space-saving stack

At roughly 10.6 inches (27 cm) with a 90° bend, the CA90 is engineered to sit almost flush against your units. That short, angled design pulls your Apex 300 and expansion batteries in close, shrinking the overall footprint of your setup. If you’re stacking multiple B300K batteries in a cabinet, a corner, or a tight utility space, this is the cable that makes it fit.

Connect and expand with confidence

• Apex 300 to expansion battery — link your Apex 300 to a B300K or B500K to add serious capacity
• Battery-to-battery — daisy-chain multiple B300K units together for even more runtime
• Reliable power transfer — a solid, secure connection designed for continuous use

Made to hold up

The CA90 uses PC+ABS flame-retardant housing (94V-0 rated) with an aluminium and TPU handle, so it’s built to take the daily plugging, unplugging, and repositioning of a real home-backup setup not just to look good in the box.

Specifications

Compatibility

Works with: BLUETTI Apex 300, B300K, and B500K including B300K-to-B300K connections.

Not compatible with: AC300, AC200L, AC200MAX, or AC500. These models use a different expansion cable (the P090A), so please check your unit before ordering.

Not sure which cable you need?

Getting the right connection cable matters the wrong one simply won’t fit your unit. If you are unsure whether the CA90 suits your BLUETTI setup, reach out before you order and we’ll confirm the correct cable for your model.