Batteries, Finnish specialist IONCOR to expand its focus to heavy-duty applications

Finnish battery specialist IONCOR is expanding its focus on heavy-duty applications, positioning its modular battery platforms for electric bus OEMs across Europe. The European battery systems specialist, formerly the battery division of Valmet Automotive, has transitioned into an independent entity and is scaling its activities in buses, trucks and off-highway vehicles under its own product portfolio.

IONCOR, that claims being one of Europe’s leading independent battery providers, entered heavy-duty electrification in May 2024 with the Energy Pack for trucks and buses, later adding Energy Pack Long in October 2025 as a dedicated configuration for bus applications.

IONCOR batteries: some key figures so far

Looking at the figures, since 2018, IONCOR has delivered more than three million battery systems to automotive and off-highway OEM customers. In 2024 alone, production reached approximately 800,000 battery systems, with gross sales of nearly €1.5 billion. The company employs around 1,000 people across its sites in Salo, Uusikaupunki and Kirchardt in Germany. Indeed, the company’s background is rooted in high-volume automotive manufacturing, including standardized quality processes and validation protocols developed for passenger car programs.

“We are not just a battery supplier, but a partner that supports the customer throughout the entire electrification lifecycle from design and simulations to prototype series and serial production. We are a ‘lifetime partner for electrification.’ The lifecycle of work machines is long, and our own manufacturing ensures that compatible battery packs will also be available in the future”, said Sami Nikkinen, Sales Manager at IONCOR.

The system developed by IONCOR thinking of heavy-duty vehicles

As for the products, the system developed by IONCOR thinking of heavy-duty vehicles is designed for truck, bus and off-highway applications and is based on a cell-to-pack architecture with an energy density of 300 Wh/l. By eliminating intermediate modules, the cell-to-pack design increases volumetric efficiency and reduces pack weight. The Energy Pack is part of a broader Modular Battery Platform that also includes the Power Pack solution.

In October 2025, IONCOR presented Energy Pack Long, a configuration developed specifically for bus applications. The system delivers 79 kWh per unit at 666 volts and can be configured up to 1,000 kWh depending on vehicle requirements.

“Operators need solutions that perform reliably across different climates, routes, and charging approaches while remaining cost-effective. Energy Pack Long has been designed specifically to meet these operational and economic requirements, helping fleets transition smoothly to zero-emission operations”, stated Roberts Abele, CEO, IONCOR.