First Phosphate Corp. (CSE: PHOS) (OTCQX: FRSPF) (FSE: KD0) announced on July 7, 2025 that it had successfully produced commercial-grade lithium iron phosphate 18650 format battery cells (“PHOS – LFP 18650 Battery Cells”) using North American-sourced critical minerals, advancing its mission to localize the LFP battery supply chain in North America.

Today, First Phosphate is pleased to announce the results of the commercial cell testing of its PHOS – LFP 18650 Battery Cells that have demonstrated the following performance:

• Battery cell capacities measured during cell testing successfully met the original manufacturing specifications (See Cell Capacity Testing Results graph below).
• Retention of battery cell capacities remained consistent at increasing discharge rates. This is significant given that the cells produced were from a small development run made with new critical materials and without prior history.
• Battery cells tested exhibited consistent and stable performance with minimal cell-to-cell variability.
• Battery cell cycle life experienced favorable retention of at least 80% initial capacity projected after 2000 discharge cycles.
• In conclusion, the PHOS – LFP 18650 Battery Cells tested are well suited for high-performance applications requiring both energy density and power capability. Battery cells showed good relative voltage stability on full discharge even up to 5C rate of current.

“The production of these commercial grade PHOS – LFP 18650 Battery Cells shows that North America does have the ability to support an end-to-end LFP battery supply chain using our own critical mineral inputs,” says First Phosphate CEO, John Passalacqua.

PHOS – LFP 18650 – Cell Capacity Testing Results

The PHOS – LFP 18650 Battery Cells were tested for capacity by discharging them at a typical C/5 rate of current. The graph above for four of the tested cells shows a consistent capacity of just over 1.6Ah which is in line with other similar commercially produced LFP 18650 format battery cells on the market.

The LFP cathode and anode materials for the PHOS – LFP 18650 Battery Cells were produced using North American critical minerals from the following supply sources:

• Phosphate: High-purity phosphoric acid produced from igneous phosphate concentrate extracted from the First Phosphate Bégin-Lamarche property in the Saguenay-Lac-Saint-Jean region of Quebec, Canada and processed in the pilot installations of Prayon Technologies of Belgium, Europe.
• Iron: Iron powder produced using magnetite concentrate from the First Phosphate Bégin-Lamarche property in Quebec, Canada and processed by GKN Hoeganaes of Tennessee, USA.
• Lithium: Lithium carbonate produced by Century Lithium Corp. (TSXV: LCE) from its operations in Nevada, USA.
• Graphite: Natural graphite-based active anode material produced by Nouveau Monde Graphite (NYSE: NMG) (TSX: NMG) from its operations in Quebec, Canada.

The production process for the PHOS – LFP 18650 Battery Cells from North American critical minerals is viewable at:

http://www.firstphosphate.com/NorthAmericanBatteryCells

PHOS – LFP 18650 Battery Cells were unveiled by First Phosphate CEO, John Passalacqua, at the Oreba3 International Conference on Olivines for Rechargeable Batteries (Montreal, July 6-8, 2025, in memory of John B. Goodenough, 2019 Nobel Laureate in Chemistry). Video of Mr. Passalacqua’s presentation at the conference can be found at:

http://www.firstphosphate.com/OREBA3

The PHOS – LFP 18650 Battery Cells were assembled and tested for First Phosphate by Ultion Technologies Inc. (Las Vegas, Nevada), a private battery technology company specializing in LFP battery materials and cells with development and pack assembly operations for North American applications.

LFP 18650 battery cells are versatile lithium-ion batteries that are widely used in industries such as robotics, automation, military and defense, data centers, telecommunications, medical devices, consumer electronics and electric mobility.

LFP 18650 battery cells can be found in autonomous electronic devices such as robots, drones and UAVs, power chargers, laptops, power tools, electric bicycles and scooters, solar storage devices, home energy and power backup units, flashlights, digital cameras, night vision goggles, medical diagnostic equipment, data centers, AI infrastructure and telecommunications towers.

In other news, The Company has granted 24,000 restricted share units of the Company to a consultant to the Company. The RSUs vest on February 28, 2026 and are subject to a four month hold period. The RSUs will be granted in accordance with and subject to the terms of the Company’s Omnibus Equity Incentive Plan.

About First Phosphate Corp

First Phosphate is a mineral development company dedicated to producing high-purity phosphate for the LFP battery industry. The Company’s vertically integrated approach connects sustainable phosphate mining in Quebec with North American battery supply chains, targeting the energy storage, data center, robotics, mobility, and defense sectors. First Phosphate’s flagship Bégin-Lamarche property in Saguenay-Lac-Saint-Jean is a rare North American igneous phosphate resource, yielding high-purity phosphate with minimal impurities.