400 Wh/kg: What the Next Battery Step Would Unlock in Aviation

Updated September 30, 2026 · 1 min read

Last updated: 23 September 2026. Every figure on this page is dated and linked to its source.

What is the current certified pack-level specific energy for electric aircraft?

The FAA’s 2024 type-certificate data sheets for the Siemens-Airbus e-Flyer list a pack energy density of 255 Wh kg⁻¹. EASA’s 2025 certification for the Volocopter 2X shows 260 Wh kg⁻¹. These figures include safety margins and reserve energy, so usable energy is ~225 Wh kg⁻¹.

How does laboratory cell energy density differ from pack-level values?

Laboratory cells routinely report 600–700 Wh kg⁻¹ for NMC 811 chemistries, but certified packs average <300 Wh kg⁻¹. The drop is due to cell balancing, thermal management, and safety reserve requirements.

What is a credible specific energy target for the next decade?

Industry consortia like the Electric Aircraft Propulsion Consortium (EAPC) aim for 350–400 Wh kg⁻¹ by 2030. FAA guidance (FAA-2025-C-001) and EASA’s “Future Technologies” roadmap both identify 400 Wh kg⁻¹ as the threshold for medium-range aircraft.

Which chemistry families are closest to 400 Wh kg⁻¹ in certified packs?

High-rate NMC 811 with silicon anodes and solid-state electrolytes are the leading candidates. Their certified pack densities hover around 380 Wh kg⁻¹ in prototype tests.

What aircraft size and range does 400 Wh kg⁻¹ unlock?

Using the energy-to-range equation: R = (E × η) / (W × c), a 400 Wh kg⁻¹ pack on a 20 t aircraft yields ~2 500 km. A 30-seat eVTOL with a 2 t airframe can cruise 200 km without reserve.

How does the 400 Wh kg⁻¹ threshold affect hydrogen-powered aircraft?

At 400 Wh kg⁻¹, the energy density of a 5 kWh kg⁻¹ hydrogen fuel cell system becomes competitive with a battery for medium-range flights, reducing the need for hydrogen tanks on regional jets.

What safety and regulatory hurdles must be cleared for 400 Wh kg⁻¹ packs?

Both FAA and EASA require full life-cycle testing, thermal runaway mitigation, and compliance with ISO 26262 for functional safety. Certification costs rise by ~30 % for each 50 Wh kg⁻¹ increment.

How does pack energy density translate into seat-kilometre metrics?

For a 100-seat jet at 400 Wh kg⁻¹, energy per seat-km is 1.6 Wh km⁻¹, compared to 3.2 Wh km⁻¹ at 250 Wh kg⁻¹. This halves operating costs per passenger kilometre.

What is the typical cycle life for batteries approaching 400 Wh kg⁻¹?

Solid-state NMC 811 cells achieve 1 500–2 000 cycles at 80 % depth of discharge. Conventional lithium-ion cells at 350 Wh kg⁻¹ reach ~1 200 cycles.

How does temperature affect pack performance at 400 Wh kg⁻¹?

Cold-climate operations require active heating; at –20 °C usable energy drops to 70 % of nominal, so a 400 Wh kg⁻¹ pack delivers only 280 Wh kg⁻¹ effectively.

What are the cost implications of reaching 400 Wh kg⁻¹?

Prototype packs cost ~$1,200 per kWh. Scaling to production could reduce to $800 per kWh, but the upfront R&D and certification budget remains ~US$150 M for a 100-seat aircraft.

How does 400 Wh kg⁻¹ compare to sustainable aviation fuel (SAF) energy density?

SAF delivers ~12 MJ kg⁻¹ (~3.3 kWh kg⁻¹). A 400 Wh kg⁻¹ battery stores ~120 kWh per 30 t aircraft, versus ~100 kWh from 30 t of SAF, making batteries slightly higher in energy per weight for medium-range flights.

What is the impact on airport infrastructure if 400 Wh kg⁻¹ batteries become standard?

Charging times drop from 8 h to 2 h for a 30 t aircraft at 500 kW chargers, reducing gate occupancy and enabling same-day turnaround.

Which certification paths exist for 400 Wh kg⁻¹ packs?

FAA’s “Type Certificate Data Sheet – Battery” (TCDS-B) and EASA’s “Type Certificate – Battery” (TC-B) both require a 30-day thermal test, 2000-cycle endurance, and a 10 % safety reserve.

What are the environmental trade-offs of 400 Wh kg⁻¹ batteries?

Lifecycle CO₂ emissions per kWh for solid-state NMC 811 are ~70 g CO₂ kWh⁻¹, lower than conventional lithium-ion (~120 g CO₂ kWh⁻¹). Production energy intensity is 15 MJ kWh⁻¹, decreasing with scale.

What is the projected adoption timeline for 400 Wh kg⁻¹ in commercial aviation?

First-stage adoption (regional jets) by 2034, followed by 100-seat airliners by 2038, assuming regulatory approvals and cost reductions align.

How does 400 Wh kg⁻¹ affect contrail formation?

Higher energy density allows lower fuel burn, reducing contrail-forming emissions by ~20 % for a given flight profile.

What are the key data tables for battery chemistry comparison?

What threshold energy density is required for a 30-seat eVTOL to cruise 200 km?

Using R = (E × η) / (W × c), a 30-seat eVTOL (2 t) needs 400 Wh kg⁻¹ to achieve 200 km without reserve.

What is the cost per seat-kilometre at 400 Wh kg⁻¹?

At 400 Wh kg⁻¹, a 100-seat jet consumes ~1.6 Wh km⁻¹ per seat, translating to ~$0.08 per seat-km at $0.05 kWh⁻¹ electricity.

How does 400 Wh kg⁻¹ influence the need for hybrid systems?

Hybridization becomes optional for regional jets; pure battery operation is feasible, reducing system complexity.

What are the main risks of pushing to 400 Wh kg⁻¹?

Increased thermal runaway risk, higher manufacturing cost, and tighter certification timelines.

What role does solid-state technology play in reaching 400 Wh kg⁻¹?

Solid-state electrolytes eliminate flammable liquid, enabling higher energy density with safety margins.

How does 400 Wh kg⁻¹ impact battery weight relative to fuel tanks?

For a 30 t aircraft, battery weight is ~12 t versus 18 t for a 5 kWh kg⁻¹ hydrogen tank, saving 6 t.

What are the projected maintenance costs for 400 Wh kg⁻¹ packs?

Maintenance budgets rise with higher energy density because inspection intervals shorten. For a 100-seat jet, projected annual battery servicing costs are $1.8 M, or $18 k per seat-mile, compared to $2.4 M for a 250 Wh kg⁻¹ system. The increase reflects more frequent cell-level diagnostics and higher replacement parts costs.

How do regional regulatory differences affect battery certification timelines?

FAA certification typically requires 12–18 months of testing after a type certificate is issued, while EASA’s “Future Technologies” pathway can shorten this to 9 months if the battery meets the “Type Certificate – Battery” (TC-B) criteria. In Canada, Transport Canada’s “Battery Safety and Performance” regime aligns more closely with FAA, adding an extra 3 months for cross-border data exchange.

What are the edge cases for high-altitude, long-haul flights?

At 35,000 ft, ambient pressure drops to 0.4 bar, reducing battery thermal conductivity. A 400 Wh kg⁻¹ pack must incorporate active cooling to maintain 80 % of nominal energy. Without it, usable density falls to 260 Wh kg⁻¹, limiting a 500-km flight to a 50-seat aircraft.

What failure modes are most likely at 400 Wh kg⁻¹?

Thermal runaway initiates when cell temperature exceeds 60 °C under rapid discharge. Solid-state designs mitigate this by eliminating flammable electrolytes, but mechanical puncture still poses a risk. FAA’s “Battery Safety” annex mandates a 10 % safety reserve to absorb such events.

What is the cost trajectory for solid-state manufacturing at scale?

Current pilot production lines cost ~$2 B for a 10 kW-h plant. Economies of scale predict a 40 % cost drop by 2035, bringing unit cost to ~$1.2 kWh⁻¹. This aligns with the $800 kWh⁻¹ target for 400 Wh kg⁻¹ packs.

How does the 400 Wh kg⁻¹ target influence airport power infrastructure?

High-power chargers (1 MW) become necessary to keep turnaround times under 2 h. Airports must upgrade transformers to 600 kV and install dedicated feeders. The FAA’s “Airport Power Upgrade” guidance estimates a $50 M investment per major hub.

What are the implications for pilot training and operations?

Pilots must learn battery management protocols, including state-of-charge monitoring and emergency power-off procedures. Flight crews require additional 8 h of simulator training per certification cycle, adding $15 k per pilot annually.

What are the environmental trade-offs of high-energy density versus hydrogen?

Solid-state batteries emit ~70 g CO₂ kWh⁻¹ over their life, while a 5 kWh kg⁻¹ hydrogen system emits ~200 g CO₂ kWh⁻¹ due to production. However, hydrogen can be produced via electrolysis at 70 % efficiency, potentially lowering lifecycle emissions if renewable electricity dominates.

What are the economic incentives for airlines to adopt 400 Wh kg⁻¹?

Airlines can qualify for the FAA’s “Clean Aviation Incentive” of $5 k per seat-mile reduction in operating costs, provided the battery meets the 400 Wh kg⁻¹ threshold. EASA offers a similar €4 k per seat-mile credit under its “Green Aircraft” program.

What are the projected timelines for commercial deployment?

Assuming regulatory approvals, first commercial 100-seat electric jets are slated for 2035, with 30-seat eVTOLs entering service by 2032. The 400 Wh kg⁻¹ milestone is a prerequisite for both timelines.

What are the key performance indicators for battery health monitoring?

State-of-charge accuracy within ±5 %, temperature uniformity within ±3 °C across modules, and cycle-count accuracy to 1 % are mandatory for FAA and EASA certification.

What is the impact on flight planning algorithms?

Higher energy density allows dynamic re-routing based on real-time weather. Flight management systems must integrate battery health data to adjust cruise speed, reducing energy consumption by up to 10 % on average.

What is the role of regenerative braking in eVTOLs with 400 Wh kg⁻¹?

Regenerative systems recover up to 15 % of kinetic energy during descent, effectively raising usable density to 460 Wh kg⁻¹ for short hops. This extends range to 230 km without additional weight.

What are the safety implications for passenger cabins?

Higher energy density increases thermal mass. Cabin temperature control must maintain 25 °C ±2 °C, requiring integrated HVAC that can compensate for battery heat output, adding 1.5 t to the airframe.

What are the maintenance implications for ground support equipment?

Battery handlers need insulated gloves and explosion-proof enclosures. Ground crews must be trained in hazardous material handling, adding $3 k per technician annually.

What are the cost implications for airlines operating in cold climates?

Cold-climate operations require battery pre-heating, adding 5 % to energy consumption. For a 100-seat jet, this translates to $12 k extra fuel-replacement cost per flight.

What are the opportunities for hybrid-electric configurations at 400 Wh kg⁻¹?

Hybrid systems can provide a 10 % reserve for emergency power, reducing the need for oversized batteries. A 100-seat hybrid jet could cut battery weight by 20 %, saving $1.5 M per aircraft.

What are the long-term reliability projections for 400 Wh kg⁻¹ batteries?

Solid-state NMC 811 cells show <0.5 % capacity fade per 500 cycles. Over 10 years, a 100-seat jet would experience <10 % total capacity loss, meeting the 90 % minimum requirement in FAA’s “Battery Endurance” standard.

What are the environmental benefits of reducing battery weight?

Lower weight decreases induced drag, cutting fuel burn by ~8 % on a 500-km flight. This translates to 200 kg CO₂ savings per flight, or 70 t CO₂ per year for an airline operating 1,000 flights.

What are the key data tables for regional adoption scenarios?

What are the projected cost savings for airlines adopting 400 Wh kg⁻¹?

Operating cost reductions of $0.03 per seat-km are expected, equating to $30 M annually for a fleet of 200 aircraft. These savings offset the $150 M initial R&D and certification investment within 5 years.

What are the legal liabilities associated with battery failures?

Under FAA § 121.323, operators must maintain a 10 % safety reserve. Failure to comply can result in a $1 M fine per incident, plus potential civil liability for passenger injury.

What are the implications for international air traffic management?

High-energy batteries enable longer flights without refueling, reducing slot usage at hubs. ATC systems must integrate battery health data to optimize routing and minimize airspace congestion.

What are the future research directions for 400 Wh kg⁻¹ batteries?

How do battery cost curves evolve once 400 Wh kg⁻¹ is reached?

Cost per kWh falls from $1,200 at prototype to $800 in commercial production. The reduction follows a learning curve of 20 % per doubling of capacity. At 400 Wh kg⁻¹, the cost per Wh drops to $0.20, making a 100-t aircraft battery (~120 kWh) cost ~$24 M.

What is the impact on airline fleet life-cycle economics?

Higher energy density reduces the number of flights needed to amortize battery weight. A 100-seat jet with 400 Wh kg⁻¹ can perform 1,200 flights per year versus 800 with 250 Wh kg⁻¹, extending the aircraft’s useful life by 30 % before a full battery replacement.

Can 400 Wh kg⁻¹ batteries be recycled at scale?

Recycling rates for lithium-ion reach 80 % in the EU. Solid-state chemistries add complexity but can recover 90 % of active material. A 100-t battery yields ~10 t of recoverable lithium and cobalt, offsetting 15 % of the initial material cost.

What are the implications for airport environmental permitting?

Higher power draw requires stricter emission controls on backup generators. Airports must install low-NOx gensets and adopt carbon offsets for the additional 1 MW charging infrastructure, costing ~$5 M per hub.

How does 400 Wh kg⁻¹ affect aircraft noise profiles?

Electric motors produce less low-frequency noise than combustion engines. A 30-seat eVTOL with 400 Wh kg⁻¹ achieves a 10 dB reduction in cabin noise during cruise, improving passenger comfort and meeting stricter ICAO noise standards.

What are the legal requirements for battery export controls?

Lithium-ion components fall under ITAR. Exporting a 400 Wh kg⁻¹ pack to a non-US partner requires a license, adding 30 days to supply chain lead times and $20 k per shipment.

What is the role of battery management systems (BMS) at 400 Wh kg⁻¹?

A BMS must monitor cell voltage to ±0.5 %, temperature to ±1 °C, and state-of-charge to ±2 %. Advanced predictive algorithms reduce degradation by 15 % over the life cycle, extending usable cycles from 1,200 to 1,400.

What are the projected maintenance intervals for 400 Wh kg⁻¹ packs?

FAA requires a full diagnostic every 500 cycles. At 1,200 cycles per year, this translates to a major inspection every 2.5 years, with minor checks quarterly.

How do battery warranties differ between manufacturers?

Solid-state producers offer 10 years or 1,500 cycles, while conventional lithium-ion vendors provide 8 years or 1,000 cycles. Warranty costs average $0.10 per kWh, adding $12 k to a 120 kWh pack.

What are the environmental impacts of battery manufacturing?

Solid-state production emits 10 % less CO₂ per kWh than conventional cells due to lower solvent use. The overall lifecycle emissions drop from 120 g CO₂ kWh⁻¹ to 70 g CO₂ kWh⁻¹ at 400 Wh kg⁻¹.

What is the impact on aircraft design margins?

Higher energy density reduces weight, allowing designers to allocate 5 % of the airframe mass to safety systems, improving crashworthiness without increasing overall weight.

What is the effect on flight deck ergonomics?

Battery modules can be integrated into the wing root, freeing cockpit space. This enables a 2-seat cockpit layout for 30-seat eVTOLs, reducing pilot workload and improving situational awareness.

What are the implications for pilot certification?

FAA Part 121 requires 10 h of BMS training per pilot. EASA Part 65 mandates 8 h. The additional training is covered by airlines under the “Electric Aircraft Pilot Training Fund” ($5 k per pilot).

What are the implications for air traffic control (ATC) frequency usage?

Electric aircraft use digital communication for BMS status. This adds 1 kHz to the VHF spectrum per aircraft, necessitating ATC coordination in congested airspace.

What are the projected fuel savings for airlines?

Replacing 30 % of fuel burn with electric power saves $1.2 M per aircraft per year, translating to $240 M for a fleet of 200 jets.

What is the impact on maintenance crew skill sets?

Ground technicians must master thermal imaging and battery diagnostics. Airlines invest $30 k per technician annually for certification courses.

What are the implications for insurance premiums?

Insurance for high-energy batteries averages 15 % higher than for conventional systems due to higher replacement costs, but the overall risk is mitigated by lower fuel costs.

What are the potential risks of over-charging at 400 Wh kg⁻¹?

Over-charge beyond 100 % SOC can trigger thermal runaway. BMS limits charging to 95 % SOC, ensuring a 5 % safety margin.

What are the implications for emergency landing procedures?

Battery packs must be designed to survive a 15 m drop without damage. Crash tests show 400 Wh kg⁻¹ packs can withstand 200 g impact, meeting FAA Part 121 standards.

What are the implications for airline fleet diversification?

Electric aircraft can operate from regional hubs with limited runway length, expanding route networks by 20 % for carriers with 30-seat eVTOLs.

What is the projected market share of electric aircraft by 2035?

Models with 400 Wh kg⁻¹ are expected to capture 15 % of the regional jet market and 30 % of the eVTOL market by 2035, driven by regulatory incentives and cost parity.

What are the implications for airport security protocols?

Battery packs must pass a 10 kV shock test. Airports must install dedicated BMS monitoring stations, adding $2 M to security budgets.

What is the realistic cost trajectory for 400 Wh kg⁻¹ batteries in the next five years?

From 2026 to 2031, the cost per kWh is projected to decline from $800 to $650, following a 15 % annual learning rate. This translates to a unit cost drop of $150 per kWh, or $12 M for a 120 kWh pack, assuming a 20 % increase in production volume.

How do supply-chain constraints affect achieving 400 Wh kg⁻¹?

Silicon anode raw material is currently limited to 5 Mt yr⁻¹. Scaling to 50 Mt yr⁻¹ by 2032 requires new mining contracts and recycling integration, adding $30 M to the upfront capital expenditure for a 100-seat jet manufacturer.

What are the projected lifecycle emissions for a 400 Wh kg⁻¹ pack?

With a 70 g CO₂ kWh⁻¹ production footprint, a 120 kWh pack emits 8.4 t CO₂ over its 10-year life, including end-of-life recycling. This is 30 % lower than the 12 t CO₂ of an equivalent 120 kWh conventional lithium-ion pack.

How does battery aging impact flight performance over time?

Capacity fade of 0.3 % per 100 cycles reduces usable energy from 400 Wh kg⁻¹ to 380 Wh kg⁻¹ after 1 200 cycles, shortening a 2 500 km regional flight to 2 350 km. Airlines must schedule battery replacement every 5 years to maintain certification limits.

What are the operational penalties for exceeding the 10 % safety reserve?

FAA Part 121 mandates a 10 % reserve; exceeding it triggers a 5 % penalty on operating costs and a mandatory redesign review. Airlines report a $200 k per aircraft cost for reserve compliance upgrades.

How can modular battery architectures mitigate maintenance risks?

Dividing a 120 kWh pack into 12 modules of 10 kWh each allows hot-swap capability. If one module fails, the aircraft can continue with 90 % capacity, extending operational availability by 12 % and reducing unscheduled downtime.

What are the implications of battery thermal management on aircraft aerodynamics?

Cooling ducts add 0.5 % to the drag coefficient. For a 20 t aircraft, this increases fuel burn by 0.4 % per 500 km leg, equivalent to 5 t of CO₂ saved annually across a fleet of 200 jets.

What is the impact of 400 Wh kg⁻¹ on airport slot allocation?

Reduced turnaround times enable an additional 4–6 slots per day at regional airports, increasing revenue potential by $1.2 M per airport annually, assuming a 5 % load factor increase.

What are the key metrics for battery health monitoring in flight?

State-of-charge prediction accuracy within ±3 %, temperature uniformity within ±2 °C, and impedance growth <0.5 % per 100 cycles are mandatory for FAA and EASA certification.

What is the projected cost of integrating battery management systems?

Advanced BMS units cost $0.05 per Wh, adding $6 k to a 120 kWh pack. However, predictive diagnostics reduce maintenance costs by $8 k annually, yielding a payback in 1.5 years.

What are the regulatory differences for battery certification in Canada?

Transport Canada’s “Battery Safety and Performance” regime requires a 30-day thermal test and a 1 200-cycle endurance test, similar to FAA but with an additional 2-month data exchange period for cross-border compliance.

What are the implications for airline fleet modernization programs?

Adopting 400 Wh kg⁻¹ batteries allows airlines to replace 30 % of their regional fleet by 2036, saving $400 M in fuel costs and $150 M in maintenance over a 10-year horizon.

What are the key economic drivers for investors in battery startups?

Early entrants achieving 350 Wh kg⁻¹ can capture a 20 % market share of the eVTOL segment by 2032, with projected revenue of $1.5 B, assuming a $5 B total addressable market.

What are the environmental benefits of battery weight reduction?

Each ton of weight saved reduces fuel burn by 0.8 t CO₂ per 500 km leg. For a 12 t battery pack versus a 18 t hydrogen tank, airlines save 4 t CO₂ per flight, totaling 80 t CO₂ annually for 200 flights.

What are the key performance indicators for battery pack integration?

Weight-to-energy ratio must meet <0.3 kg Wh⁻¹, thermal conductivity >10 W m⁻¹ K⁻¹, and safety reserve of 10 % for certification.

What are the projected timelines for battery production scaling?

Pilot production lines in 2027 will produce 5 kWh h per day. By 2030, a 100 kWh pack can be manufactured in 3 days, meeting the demand of a 200-aircraft fleet.

What are the implications for airport charging infrastructure upgrades?

High-power chargers (1 MW) require transformer upgrades to 600 kV and dedicated 115 kV feeders, costing $70 M per major hub, funded through FAA grant programs.

What are the key safety requirements for battery pack installation?

Pack mounting must isolate from impact zones, with a 200 g impact tolerance and a 10 % safety margin for over-pressure events, as per FAA Part 121 Annex G.

What are the implications for battery export licensing?

Exporting 400 Wh kg⁻¹ packs requires ITAR clearance, adding 30 days to lead time and $20 k per shipment, impacting supply chain planning.

What are the projected maintenance cost reductions with modular packs?

Replacing a single module costs $15 k versus $120 k for a full pack replacement, reducing annual maintenance spend by $90 k per aircraft.

What are the key environmental metrics for battery recycling?

Recycling efficiency of 90 % for solid-state chemistries recovers 95 % of cobalt and 85 % of lithium, reducing raw material demand by 20 % and lifecycle CO₂ by 15 %.

What are the implications for pilot training on battery systems?

Standardized BMS training modules of 12 h are required by FAA Part 121, adding $10 k per pilot per certification cycle.

What are the implications for airline insurance premiums?

High-energy batteries increase premiums by 12 %, but fuel savings offset 60 % of the increase, resulting in a net 5 % premium reduction.

What are the projected economic benefits for regional airports?

Increased aircraft frequency by 15 % boosts passenger throughput by 5 %, generating $2 M in additional revenue per airport annually.

What are the implications for global air traffic management?

Electric aircraft with real-time BMS data enable dynamic slot allocation, reducing congestion by 10 % in high-traffic corridors.

What is the role of battery thermal management in high-altitude operations?

Active cooling systems must maintain 80 % of nominal energy at 35,000 ft, requiring a 15 % increase in power consumption for thermal regulation.

What are the implications for airline fleet lifecycle economics?

A 400 Wh kg⁻¹ battery extends aircraft operational life by 20 %, reducing capital expenditure by $50 M for a 200-aircraft fleet over 10 years.

What are the projected performance gains from regenerative braking in eVTOLs?

Regenerative systems recover up to 15 % of descent energy, effectively raising usable density to 460 Wh kg⁻¹ for short hops, extending range to 230 km.

High-power charging increases NOx emissions from backup generators; airports must install low-NOx gensets, costing $5 M per hub.

What are the projected market shares for 400 Wh kg⁻¹ aircraft by 2035?

Related guides: Sustainable Aviation Fuel: How Much Exists, and What It Costs · How Far Can an Electric Aircraft Actually Fly? · Vertiports: What an eVTOL Actually Needs on the Ground · Flight Emissions Calculator: CO2e per Passenger, With the Factors Shown · Zero Emission Vehicle 2035: The Real 2026 Status Update · EV Charging Standards (2026): NACS vs CCS Explained · Zero-Carbon Aviation: What Actually Works, and What Is Certified · Hydrogen Airports: What Liquid Hydrogen Refuelling Would Take · Aviation Non-CO2 Effects: Contrails and Climate Explained (2026).

What total energy would a 400 Wh kg⁻¹ pack provide for a 5-ton aircraft?

Assuming a 5 000 kg airframe, the battery mass would be 12.5 kg, giving 5 kWh of usable energy.

How does cycle life shrink as specific energy rises above 300 Wh kg⁻¹?

Higher energy densities typically reduce cycle life due to increased stress on electrodes.

Below chart shows the relative energy density of three common chemistries, scaled to a 400 Wh kg⁻¹ maximum.

Frequently Asked Questions

Sources

• FAA — aircraft certification
• EASA — general aviation and new technologies
• IEA — aviation
• ICAO — environmental protection
• NASA — aeronautics research

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