Finally, I found a compact power station that supports expansion batteries
Briefly

EcoFlow's Delta 3 Plus is a compact portable power station measuring 16 x 8 x 11 inches and weighing 27.6 pounds. It features a 1,024Wh battery pack that is IP65 rated for dust and water-resistance, improving its durability and safety. The station can output 1,800W via AC outlets, handling surges up to 3,600W, and provides 140W through USB-C and 36W through USB-A. Fast charging capability allows it to reach full capacity in under an hour when using 1,500W input power.
The Delta 3 Plus features a 1,024Wh battery pack that's IP65 rated for dust and water-resistance, increasing its lifespan and reducing the risk of fires and short circuits.
This unit can push a very respectable 1,800W via the AC outlets and handle short surges up to 3,600W, along with 140W through the USB-C ports.
The ammo crate style handles make lifting and moving the Delta 3 Plus easier, providing comfort and balance despite its 27.6-pound weight.
The size of the Delta 3 Plus makes it ideal for transportation, measuring 16 x 8 x 11 inches, and fitting easily into a car trunk.
Read at ZDNET
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