One of the world’s best energy storage and cycling technologies.

UltraBattery® is a hybrid device – a chemical combination of a lead-acid battery and an ultracapacitor, achieving higher-rate partial-state-of-charge (PSoC) operation with extended longevity and high efficiency.

UltraBattery Technology

The image 'UltraBattery Technology' shows a standard lead-acid cell at top left and a lead-carbon ultracapacitor at top right. The unique UltraBattery, shown in the center, is a combined cell with a single electrolyte. It has many design improvements over standard lead-acid technology, but its key feature is the combination of the high-performance carbon ultracapacitor with the lead-negative electrode.

The specialized carbon in the ultracapacitor layer creates not only a strong Hermholtz layer (the driving structure of electric double-layer capacitance) but also a highly conductive lattice of extremely large surface area, improving access to reaction sites in the battery’s active material.

The chemical reaction that pushes charge back and forth when you need it occurs at fast rates during both charge and discharge, delivering high-efficiency charge transfer.

Traditional lead-acid batteries are used all over the world, with most types suited to either high-power or sustained energy discharge. UltraBattery performs both of these tasks better than traditional batteries, and combines these capabilities with a specialized capability for operation in partial state of charge (PSoC).

New Lead-Acid Battery Technology - UltraBattery from Ecoult
New Lead-Acid Battery Technology - UltraBattery from Ecoult

Extraordinary Features of UltraBattery Performance

  • UltraBattery charges and discharges at incredibly high rates. It is a serious industrial-strength power pack able to charge at greater than 1C (1-hour rate).

  • Unlike its lead-acid predecessors, it does not need to frequently recharge fully. It cycles continuously in partial state of charge, with no float periods and very infrequent refresh.

  • Its unique chemistry not only increases power handling but vastly reduces sulfation, allowing it to run continuously for months without going to full charge.

  • It is long lasting, cycling at high rates year after year.

  • It is tough and tolerant, and Ecoult’s monitoring system holds tight voltage balance between batteries in long strings.

  • It works at high efficiencies (rate dependent, but usually well above 90%) generally superior to alternative battery chemistries.

The graph below shows a 12 V UltraBattery being used in an application requiring constant variability management, such as may be required in micro-grid stabilization, renewable smoothing or other tasks requiring control of power quality. There are no float periods or rests, and UltraBattery will operate this way every day for at least a month before a few hours of refresh – month after month, year after year.

System Request and UltraBattery Response (single 12 V UltraBattery)
System Request and UltraBattery Response (single 12 V UltraBattery)

The gray trace is the application’s requested charge or discharge power. The orange trace is UltraBattery’s response. UltraBattery faithfully satisfies the request in a way few technologies can match.

Ecoult UltraBattery

UltraBattery units work silently and efficiently, fully monitored in their passive cooled racking.

fast cycle

Fast cycling

UltraBattery delivers what renewable, grid, and microgrid variability management requires: a battery that can charge and discharge continuously and fast.



A remarkable 92–95 percent of every unit of energy stored in UltraBattery is available for re-use.

environment energy

Environmental Sustainability

We steward a truly sustainable, closed-loop technology that is helping to create a greener, lower-carbon energy system for the planet.

UltraBattery Safety and Sustainability

While UltraBattery easily handles high-voltage grid applications, it is also perfectly suited to safe extra-low-voltage (SELV) applications. With UltraBattery, seriously high power is available at 48 V.

It has a non-combustible chemistry and it is housed in a proprietary super-tough, flame-retardant plastic casing.

It is also fully sustainable, like all batteries in the lead-acid family. In fact, with 98% of lead-acid batteries returned for reprocessing, and 96% by mass of each returned battery used to make new batteries, lead-acid batteries are not only the most sustainable battery type by far, they’re actually the most sustainable product of any type ever mass manufactured.

Australian-invented and World-leading

UltraBattery was invented by Australia’s CSIRO, and is the powerhouse behind all of Ecoult’s world-leading energy storage solutions.

For modern energy storage applications such as grid regulation and renewable smoothing, which require continuous charge and discharge, we believe UltraBattery is the best cycling battery in the world.