EXECUTIVE SUMMARY

Amprius Technologies (NYSE: AMPX) exhibited at Automate 2026 (June 22–25, McCormick Place, Chicago) at booth 36017, presenting its SiCore SA88 silicon-composite anode pouch cell. The SA88 was named one of three finalists in the Components, Hardware & Enabling Technologies category at the Automate Innovation Awards ceremony held on June 23. The cell delivers 358 Wh/kg and 750 Wh/L at C/5 discharge rate, with a 10 Ah nominal capacity and a maximum continuous discharge rate of 3C. Amprius positions the SiCore platform as a commercially available, scalable alternative to graphite-anode lithium-ion cells for robotics, AMR, UAV, and aerial mobility applications where mass budget is a primary system constraint.

Industry Context

Conventional graphite-based lithium-ion cells used in autonomous mobile robots (AMRs) and unmanned aerial vehicles (UAVs) typically deliver 250–280 Wh/kg. At this energy density, payload capacity, mission endurance, and operational cycle time impose practical limits on deployment economics. For AMR platforms running 16- to 20-hour warehouse shifts, battery weight directly affects the trade-off between counterweight requirements, floor load ratings, and effective payload. For multirotor UAVs, battery mass constrains hover time and sensor payload simultaneously.

The Automate Innovation Awards, administered by A3 (Association for Advancing Automation), recognize components and systems that demonstrably advance automation capability. The Components, Hardware & Enabling Technologies category covers drives, motors, metrology tools, cables, connectors, and enabling infrastructure. The appearance of a battery cell as a finalist in this category reflects growing recognition among automation engineers that energy storage architecture is a first-class design variable in mobile robotics.

Technology

SiCore Platform

Amprius markets two silicon-anode product lines. SiMaxx uses 100% silicon nanowire anodes grown directly on copper foil substrates via roll-to-roll chemical vapor deposition (CVD). SiCore uses silicon-composite anode materials — silicon blended with carbon matrices — offering lower energy density than SiMaxx but improved cycle life and scalability at commercial volumes.

The SA88 is the current commercial flagship of the SiCore line. Published specifications from Amprius' product page and confirmed via the About:Energy Voltt database state an energy density of 358–370 Wh/kg at C/5 and 750 Wh/L volumetric density. Capacity is 10 Ah in a pouch cell form factor. Maximum continuous discharge is 3C, with a 1C charge rate.

Table 1: Amprius Cell Portfolio — Verified Specifications

Sources: Amprius product pages (amprius.com/products/sa88, amprius.com/solutions/sicore); CTO presentation slides (HAPS Conference 2025); Amprius X/Twitter post referencing About:Energy Voltt listing. Note: SiMaxx 520 Wh/kg specification is the CES 2026 Best of Innovation submission; commercial SiMaxx cells in production are listed at 450–500 Wh/kg range.

Silicon Volume Expansion — Engineering Approach

Silicon anodes store approximately 10 times more lithium per unit mass than graphite, but undergo volumetric expansion of up to 300% during lithiation. Unmanaged, this expansion causes particle fracture, loss of electrical contact, and rapid capacity fade. Amprius addresses this through nanoscale geometry: in SiMaxx, individual nanowires are rooted to the copper substrate at one end, with free lateral space to accommodate expansion without delamination. In SiCore, silicon particles are embedded in carbon matrices with engineered porosity to buffer volume change. The company reports up to 1,300 full-depth discharge cycles for SiCore, compared to 300–500 cycles for early silicon-composite approaches.

Drone Flight Time — Benchmarking

In May 2026, Amprius reported that in a head-to-head comparative test, its high-energy silicon anode cell extended drone flight time by more than 80% versus a comparable graphite-based cell of equivalent pack volume. The company attributed this improvement to both higher gravimetric energy density and the ability to discharge at useful C-rates without significant energy density penalty.

Engineering Analysis

Relevance to AMR Platforms

For warehouse and logistics AMRs, the primary energy storage metrics are Wh/kg (mass efficiency), cycle life (total cost of ownership), and charge rate (fleet utilization). At 358 Wh/kg, the SA88 offers approximately 25–40% more energy per kilogram than high-performance graphite cells. For a 24 kg AMR battery pack, this translates to approximately 3–5 additional kilowatt-hours per charge cycle at equivalent mass — extending shift coverage or enabling a smaller, lighter pack for the same endurance target.

The 3C continuous discharge rate of the SA88 is compatible with the power profiles of AMR drive systems in the 2–5 kW range. However, integrators should note that the SA88 charge rate is specified at 1C, which constrains opportunity-charging window length versus some graphite cells rated at 2–3C charge. Battery management system (BMS) design and thermal management at the pack level are not public for the SA88; integrators will need to characterize these parameters during qualification.

Relevance to UAV and Aerial Platforms

For multirotor UAVs, hovering efficiency scales inversely with total system weight. A 30% reduction in battery pack mass at constant capacity directly translates to either longer endurance or increased sensor payload. At 750 Wh/L, the SA88 also enables more compact pack geometries, which can improve aerodynamics and reduce mechanical complexity in tight airframe designs.

The 3C continuous discharge rate supports typical UAV cruise power draws but may constrain platforms requiring sustained high-C transient power for vertical takeoff and landing (VTOL) maneuvers. Amprius' SiMaxx cells, which support up to 10C pulse discharge, are better suited for VTOL and eVTOL applications with high instantaneous power demands. The SiCore SA88 is positioned for fixed-wing and hybrid VTOL platforms where cruise endurance dominates the power profile.

NDAA Supply Chain Considerations

Amprius manufactures silicon anodes and pilot-production cells at its Fremont, California facility. Volume production is handled through a contract manufacturing strategy. In its June 2026 UAV webinar (June 17), CTO Dr. Ionel Stefan addressed NDAA (National Defense Authorization Act) compliance considerations for defense UAV integrators. Amprius has publicly disclosed it partners with contract manufacturers across Asia and the US. Customers procuring for U.S. government or NDAA-sensitive programs should conduct supply chain due diligence accordingly.