Durable ultracapacitors for adverse environments

Featured Product from Richardson RFPD

Hot and humid environments present a variety of system engineering challenges: These conditions often limit lifespans and cause premature failure in competitor products, leading to higher numbers of field replacements and higher maintenance costs.

Maxwell’s XP™ Series from Richardson RFPD overcomes these common industry challenges and comprises ultracapacitor cells designed specifically for reliable performance in applications operating in adverse conditions. The XP Series includes all the benefits of the Standard Series with the added advantages of:

  • Advanced structure and sealing to provide the additional protection necessary for demanding environmental conditions and strict industrial standards
  • 3X the lifetime of Standard Series cells in high heat and humidity environments

Industry Leading High Heat and Humidity Performance

This product line offers 2.7-volt ultracapacitor cells with storage capacities from 3 to 50 farads. XP Series cells are compliant with RoHS, UL and REACH requirements, giving you the confidence in your selection of the highest quality ultracapacitor energy storage solution for your system.

Maxwell’s XP Series cells operate in applications across industries and have contributed to our customers’ goal of zero system maintenance after deployment.

Maxwell’s Technology Innovation Cultivates Customer Field Success.

Maxwell takes pride in having paved the path for high-power, fast-response ultracapacitor energy storage solutions designed for short-term power requirements that many industries have struggled to meet using other energy storage technologies.

Maxwell’s experience in the design and development of ultracapacitor cells led to the company being first-to-market once again with a product line that provides our customers with the performance they need for high heat and humidity conditions. Two applications where our customers have had exceptional success with our patented XP Series include:


The XP Series provides automakers with high-power energy storage cells that enable a smaller footprint, weight savings and excellent temperature performance while achieving automotive quality certification.

Smart Meter:

Utilities deploy Maxwell’s XP Series cells for smart meters due to the cells’ first-rate performance in low outdoor temperatures, ensuring immediate transmission of data and minimal field replacements.


  • Smart metering
  • Automotive (data logging, advanced driver assistance systems, autonomous driving, backup power)
  • Uninterruptable power supply (UPS)
  • Robotics
  • Telematics
  • Medical devices
  • Consumer electronics
  • Actuators
  • Emergency lighting
  • Security equipment

†Based on results from biased humidity testing