Cybercab battery: four sealed modules in a steel case to cut robotaxi service costs
The Cybercab pack is split into four individually sealed modules, so a failed module can be swapped without replacing the whole pack — a design aimed at keeping high-mileage robotaxi service costs down, with room reserved for LFP cells later.
Per Teslarati's write-up of Munro Live's Cybercab teardown, the pack is built from four individually sealed modules, so one failure does not mean replacing the entire pack. It is Tesla's first pack in a steel enclosure, swaps the wiring harness for wireless battery-management boards, and uses new contactors that remove the need for a pyro fuse. The tour describes an 88S6P layout of 528 4680 cells.
Robert Sumpf, Tesla's director of mechanical design engineering for battery modules and packs, said the company "protected this pack" for a lower-energy-density chemistry, leaving space beside and beneath the modules for more LFP cells. LFP stores less energy per unit volume, so extra cells would offset the range loss. The article says LFP is cheaper, runs cooler and lasts more charge cycles, but no timing, cell supplier or range impact was given.
Serviceability is the point. Chief engineer Eric Earley said replacing a whole pack before half a million miles would be costly, so the pack was designed to be repaired. Sumpf said a fully structural pack adds roughly 10% more cell volume, but service cost is the real problem. Tesla's battery director graded the Cybercab pack A-, versus D for the Model Y structural pack and B- for Cybertruck. Capacity was described to Sandy Munro in early 2025 as a target of under 50 kWh and close to 300 miles; the article does not confirm a final figure.
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