Description
Unlock relentless power with the Ampace JP40, a tabless 21700 cell engineered for extreme high-drain applications. This 4-pack delivers a robust 45A continuous discharge (with 60A capability under active cooling) and a staggering 120A pulse output, all while maintaining 4000mAh capacity. Designed for high-performance e-bike battery packs, heavy-duty cordless tools, competition , and FET-driven flashlights, the JP40 utilizes tabless technology to achieve ultra-low internal resistance (~6mΩ), virtually eliminating voltage sag under the heaviest loads. The flat top design ensures compatibility with spring-contact devices and simplifies spot-welding for custom battery builds. When your device demands maximum current without compromise, the Ampace JP40 delivers.
Key Features
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45A Continuous / 60A with Cooling / 120A Pulse – Massive current headroom for the most demanding applications. Handles e-bike motor surges, angle grinder start-ups, and super-sub-ohm builds with ease.
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4000mAh Balanced Capacity – Optimized for high-drain use. Provides significantly longer runtime than typical 3000–3500mAh high-power cells while maintaining extreme current output.
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Tabless (All-Tab) Technology – Reduces internal resistance to ~6mΩ. Minimizes heat build-up, maximizes power delivery, and ensures rock-steady voltage under extreme loads.
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Flat Top Design – Universally compatible with 21700 spring-contact chargers, battery trays, and flashlights. Ideal for spot-welding nickel strips in custom high-current battery packs.
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4-Pack Convenience – Perfect for building a compact high-current pack, equipping dual-battery mods, or powering a set of heavy-duty tools.
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Ampace Quality & Safety – Built with rigorous testing and safety mechanisms including pressure relief vents. Consistent A-grade cell performance trusted by professionals.
Parameters
Applications
Recommended For
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High-Performance E-Bikes & E-Scooters: Build compact, high-power battery packs (e.g., 10S1P or 10S2P) for rapid acceleration and hill climbing. Always use a BMS rated for at least 80A.
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Heavy-Duty Cordless Power Tools: Angle grinders, circular saws, rotary hammers, and chain saws that require sustained high current without voltage sag.
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Competition Vaping: Super-sub-ohm mechanical mods and high-wattage regulated devices (builds down to ~0.06Ω) benefit from the massive current capability and near-zero voltage drop.
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Extreme-Output Flashlights: FET-driven hot-rod lights and multi-emitter searchlights that demand 30–50A on turbo can sustain full brightness with this cell.
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RC Cars, Boats & FPV Drones: Instantaneous 100A+ bursts for explosive starts and acrobatic maneuvers.
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Portable Spot Welders & High-Power Inverters: Multi-cell configurations deliver immense short-circuit currents for demanding DIY projects.
Not Recommended For
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Low-Power Long-Runtime Devices: Solar lights, wireless sensors, and doorbells. The JP40 is severe overkill; use a high-capacity 10A cell like the Samsung 50G or EVE 58E.
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18650-Only Devices: This is a 21700 cell (21mm x 70mm) and will not physically fit.
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Standard USB Power Banks: The extreme performance is wasted in low-current applications.
FAQ
Q: What is the true continuous discharge — 45A or 60A?
A: The official Ampace continuous rating is 45A. However, with adequate active cooling (e.g., forced air or good pack ventilation), the cell can safely deliver 60A continuous. For maximum cycle life and safety, we recommend designing your system to operate at 45A continuous, with 60A reserved for shorter high-demand scenarios. The pulse rating remains 120A.
Q: Can I use this battery for vaping? What resistance is safe?
A: Yes, the JP40 is an excellent choice for extreme sub-ohm vaping. With 45A continuous and 120A pulse at 3.6V nominal, it can safely power builds down to approximately 0.06Ω. Always use Ohm's law to calculate your actual current draw and never exceed the pulse rating for more than a few seconds.
Q: What does tabless technology mean for performance?
A: Tabless cells eliminate traditional thin metal tabs connecting internal electrode layers. Instead, the entire electrode edge connects directly to the terminal. This dramatically lowers internal resistance (~6mΩ), reduces heat generation, and allows for much higher current delivery with minimal voltage sag — critical for e-bike acceleration and power tool torque.
Q: Is this battery protected?
A: No, the JP40 is an unprotected flat top cell, standard for high-drain applications. For multi-cell packs, you must install an external BMS rated for at least 80A.
Q: How should I store these cells when not in use?
A: Store at 3.6–3.7V (approximately 40–50% charge) in a cool, dry place using non-conductive battery cases. Avoid storing fully charged or deeply discharged for extended periods.
