HPQ CEO Explains How GEN4 Cells Exceeded 7,000 mAh and Why Accessing Energy Below 2.5V Could Change Lithium-Ion Battery Design

In a recent interview, HPQ CEO Bernard Tourillon discussed the Company’s latest milestone: GEN4 silicon-based 21700 lithium-ion cells exceeding 7,000 mAh under extended voltage testing conditions.

The conversation focused on what makes this result materially different from prior announcements. While the headline number is significant, the key development lies in the ability to access additional battery capacity below the traditional 2.5V cutoff—without triggering the degradation typically seen in conventional lithium-ion chemistries.

Tourillon explained that most lithium-ion batteries are designed to stop discharging at 2.5V, leaving unused energy inaccessible due to the risk of damaging the cell. HPQ’s GEN4 material, however, demonstrated the ability to safely cycle down to 0.55V, unlocking additional capacity while maintaining stability over 70 cycles with less than 2% degradation.

The interview also explored the commercial implications of this performance. Early discussions are underway with drone manufacturers and defense-related applications—segments where extended runtime and energy density can provide a measurable advantage. The Company confirmed that inbound interest is increasing, with multiple conversations progressing toward potential commercial validation.

At the same time, HPQ continues to advance its broader strategy, including developing a North American supply chain for silicon-based battery materials and integrating its HPQ ENDURA+ platform into real-world applications.

By watching the interview, you’ll gain:

• Why accessing energy below the 2.5V cutoff could change how battery capacity is defined
• How GEN4 achieved 7,000+ mAh while maintaining cycle stability under extended conditions
• Which niche markets (drones, defense, specialized applications) are driving early commercial interest
• What “the phone is ringing” means in terms of real industry engagement
• How HPQ is positioning ENDURA+ for commercialization in North America

Watch the full interview here:

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