BAIC’s electric vehicle brand, Arcfox, has officially filed regulatory documentation for a battery-swappable version of its S3 model. This expands CATL’s “Choco-SEB” (Chocolate Swapping Electric Block) battery-swap network, bringing another automaker into the rapidly evolving landscape of EV refueling alternatives.
Vehicle Specifications and Dimensions
The Arcfox S3, designed for battery swapping, measures 4,916mm in length, 1,900mm in width, and 1,480mm in height, with a 2,876mm wheelbase. It will be powered by a 159 kW (213 hp) electric motor.
The Rise of Battery Swapping in China
CATL first unveiled its Choco-SEB system at Auto Shanghai 2025, announcing compatibility with ten new EV models from five major Chinese automakers, including BAIC. The Arcfox model was initially undisclosed, described only as a “high-quality, wide-body electric family sedan.” Earlier this month, Arcfox publicly announced a “deep partnership” with CATL to upgrade user charging experiences, aiming for 99-second full battery swaps.
Battery Suppliers: CATL vs. Alternatives
Regulatory filings confirm that the battery-swappable S3 will use CATL batteries, while the standard electric version will source batteries from CALB, EVE, and GAC’s Great Bay Technology (GBT). This supplier diversification highlights the fragmented yet competitive nature of the EV battery supply chain.
Competitive Context: Late to the Game?
Arcfox joins Changan and GAC, both of which have already launched battery-swapping models. Chery also previously filed for a battery-swapping version of its V23, making the Arcfox S3 a relatively late entrant to the market.
Battery Swap vs. Supercharging: A Speed Advantage?
The emergence of BYD’s Blade Battery 2.0 and expansion of its fast-charging infrastructure has led to questions about the long-term viability of battery swapping. However, CATL claims its 99-second swap time remains faster than BYD’s megawatt supercharging.
Unlike supercharging, which can vary in duration depending on battery condition and charging power, the battery swap model guarantees a consistent 99-second exchange. This predictability may be a key advantage for users seeking a reliable, ultra-fast refueling experience.
This difference in consistency is notable: while BYD’s superchargers can deliver rapid charging, real-world performance varies, potentially lengthening charge times for older or less efficient batteries. The standardized swap time ensures all compatible vehicles receive the same level of speed.
The Arcfox S3’s addition to the Choco-SEB network signals continued momentum for battery swapping as a viable alternative to traditional charging, particularly in scenarios where speed and predictability are paramount.
