Maxwell adds to K2 series of ultracapacitor cells
The new 2.85-volt, 3400-farad ultracapacitor cell increases the range of available specific power and stored energy and introduces DuraBlue Shock and Vibration Technology.
Maxwell Technologies Inc. announced the latest addition to its K2 series of ultracapacitor cells.
The new 2.85-volt, 3400-farad ultracapacitor cell increases the range of available specific power and stored energy in the industry-standard 60 mm cylindrical “K2” form factor and introduces DuraBlue Shock and Vibration Technology, the newest innovation in ultracapacitor reliability and performance.
DuraBlue Technology is tested to some of the most demanding environmental requirements for transportation, increasing vibration resistance by approximately 300% and shock immunity by 400% when compared with ultracapacitor-based competitive offerings.
Unlike batteries, Maxwell ultracapacitor products store energy in an electrical field that is larger than that of a capacitor — meaning ultracapacitors have greater energy storage capacity than capacitors. This electrostatic energy storage mechanism enables ultracapacitors to charge and discharge in as little as fractions of a second, perform normally over a broad temperature range, operate reliably in hundreds of thousands or more duty cycles, and resist shock and vibration.
Maxwell offers ultracapacitor cells ranging in capacitance from one to 3400 farads and multi-cell modules ranging from 16 volts to 160 volts, which have proven to deliver high power, whether used alone or paired with batteries, in a variety of applications from automotive or industrial to consumer electronics, transportation and beyond.
More Rail

New York MTA Leverages Zoning Program to Advance Station Accessibility
Accessibility enhancements at Nevins St Station will be financed through a development agreement tied to the MTA's Zoning for Accessibility initiative.
Read More →
Virginia's $28.5B Transportation Plan Targets Transit and Rail
Approved by the Commonwealth Transportation Board, the program supports ongoing infrastructure projects while providing new investments in transit, state of good repair and transportation alternatives.
Read More →
DOT: Brightline Corridor Incidents Fall 30% Following Federal Safety Upgrades
Safety improvements funded through a $25 million federal investment are credited with reducing trespassing and train-vehicle collisions along the Brightline Florida corridor.
Read More →
D Line Expansion Fuels Growth Across LA Metro's Rail System
Weekend rail ridership was especially strong, soaring 18% as riders embraced expanded access to jobs, entertainment, dining, and cultural destinations, said the agency. Total system ridership for May, including bus and rail, was 26,966,657.
Read More →
Southern California's Metrolink Debuts Contactless Fare Payment Pilot
Customers traveling between Redlands and Los Angeles can now tap their preferred payment method, including a credit or debit card, mobile wallet, or wearable device, at station validators before boarding and again while exiting.
Read More →
California's BART Approves FY27 Budget While Maintaining Service Levels
The budget covers July 1, 2026, through June 30, 2027, a period when pandemic emergency funds run out, the District faces a structural deficit of $375 million, and a regional transit funding measure may appear on the November ballot.
Read More →
Penn Station Transformation Advances with Design Unveiling
The historic redesign will transform the busiest transit hub in the Western Hemisphere from the tracks to the street level, creating a more efficient, cleaner, and functional experience for more than 600,000 daily commuters and millions of visitors.
Read More →
Second Avenue Subway Phase 2 Advances into Major Construction Stage
New York Governor Kathy Hochul joined leadership from the MTA, elected officials, and Harlem community leaders to break ground on the major construction stage of the transformative Second Avenue Subway Phase 2 project.
Read More →
The Invisible Infrastructure of Passenger Flow
What a seat reservation system on Austria’s Railjet trains reveals about the future of rider experience, and why U.S. agencies should pay attention.
Read More →
Caltrain Board Approves FY27 Budget, Endorses Efficiency Measures
The move ensures Caltrain service will continue operating as usual in the near term, but long-term financial challenges remain for the rail agency absent a new revenue source.
Read More →