Keeppower has launched a new “Selected Battery Cells” series, which features the highest capacity cells available, ranging from 18350 to 26800. All cells in this series utilize Chinese-made batteries.
As a leading innovator in battery solutions, Keeppower proudly introduces its 18650 4000mAh Li-ion Rechargeable Battery. This cell offers the highest capacity in its category. It is engineered to deliver consistent, verified performance. It ensures extended runtime, making it ideal for demanding industrial applications.
We recognize that many professionals may have questions, especially since mainstream 18650 cells from major manufacturers like Panasonic typically peak at around 3500mAh to 3600mAh. Keeppower is here to address any inquiries you may have.
Verified Capacity: 4000mAh Guaranteed
One of the most common concerns among users is whether high-capacity batteries truly deliver the promised energy. Keeppower’s 4000mAh Li-ion Rechargeable Battery Cells can achieve a measured capacity of 3900mAh (Test data: 2A charge/discharge: 3965.5mAh, 3A charge/discharge: 3948mAh, Test Date: January 16, 2024). Results consistently demonstrate that our 18650 batteries meet or exceed the typical peak 3500-3600mAh capacity, offering users highly reliable energy for extended device operation. This verified capacity ensures that your devices, from power tools to portable electronics, operate at peak performance.
Custom Battery Solutions for Your Brand
At Keeppower, we understand that one size does not fit all. That’s why we offer customized 4000mAh Li-ion Rechargeable Battery Cells to meet specific client needs. From customized combinations (1S–20S) to unique packaging and branding, we design our solutions to integrate seamlessly into your products. Keeppower actively provides a simplified process for businesses, enabling rapid prototyping and scalable production while maintaining high quality.
Usage Scenarios for High Capacity Keeppower 18650 Cells
High-capacity 18650 cells are primarily used in application where extended runtime is prioritized over high-current delivery(High –drian).
High-lumen flashlights— To maximize continuous runtime, especially for high-lumen, or prolonge use during hiking, camping, or professional security/search work.
Laptop battery packs—Historically and currently used in multi-cell configurations (e.g., $3S2P$ or $4S2P$) to provide long battery life.
Electric bicycles & Scooters—Used in large battery packs where maximum range and energy density are crucial, particularly in commuter or lower-speed models.
Consumer/Medical devices—Portable ventilators, infusion pumps, small home appliances, GPS trackers, and other electronics that require stable, long-lasting power.
Solar & Energy storage systems—Used in off-grid solar lighting, small home backup systems, or DIY battery walls where maximizing overall kWh storage is the goal.
Power Your Devices with Confidence
The Keeppower 4000mAh Li-ion Rechargeable Battery Cells delivers what other batteries only promise: actual tested capacity, safety, and dependable performance. With our commitment to innovation and customer-centric solutions, businesses can rely on Keeppower to power their devices efficiently and reliably. Explore our full range of high-capacity 18650 batteries and take advantage of customized battery solutions to optimize your product performance.