45 Amps. Continuous. Period.
Stop scrolling. You've found the cell that doesn't lie about its ratings. The Molicel INR-21700-P42A delivers a genuine 45A continuous discharge — not a "pulse" number masquerading as continuous, not a lab-only peak. Forty. Five. Amps. Paired with a 4200mAh capacity, it’s the highest-performance 21700 you can buy without stepping into exotic territory. Two cells in this pack. That's 90A of combined current capability and 31 watt-hours of energy. Build. Swap. Dominate.
Numbers Don't Lie
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≤14mΩ internal resistance. At 45A, voltage drop is just 0.63V. Your gear never starves.
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15.5Wh per cell. Enough juice to run a 3000-lumen turbo light for solid bursts, not seconds.
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500+ cycles to 70% capacity. Treat it rough — it’ll still wake up ready.
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70.0mm × 21.4mm. Standard 21700 flat top. Drops into anything designed for unprotected 21700s.
Unprotected Flat Top — As It Should Be
No PCB. No button. No extra length. No resistance you didn't ask for. The P42A is a bare cell, built for hobbyists and pros who know how to handle lithium-ion safely. Use a 4.2V charger. Use devices with low-voltage cutoff. That's it. The cell's own PTC, vent, and CID handle the rest.
Born for This
Flashlight turbo junkies: your FET-driven SBT90.2, quad W2, or multi-emitter hot-rod finally has a cell that feeds it without voltage collapse. RC racers and drone pilots: build a 4S pack and feel the instant punch. Power tool rebuilders: replace those saggy old cells and bring your 18V drill back to life. This isn't a "general purpose" battery — it's a precision instrument for people who push their gear to the edge.
Two Cells. Infinite Possibilities.
Keep a spare in your pocket. Build a 2S pack for a portable monster. Weld them into a tool battery. The 2-pack gives you flexibility without the bulk of a case lot.
Key Features
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45A Continuous / 50A+ Pulse – True, verified, no marketing fluff.
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4200mAh Real Capacity – 15.5Wh per cell. Runtime that respects the amps.
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Standard 21700 Flat Top – 70.0mm × 21.4mm. No button, no PCB.
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≤14mΩ Ultra-Low IR – Minimal sag, maximum power delivery.
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500+ Cycles – 70% capacity retention after hundreds of charges.
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Passive Safety – PTC, vent, CID. Built-in protection you can trust.
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2-Pack – Build, swap, or backup.
Technical Parameters
Applications
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Turbo Flashlights – FET monsters, multi-emitter builds, SBT90.2 hot-rods.
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FPV Drones & RC – 4S/6S racing packs, 1/8 scale truggies, speed runs.
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Power Tool Rebuilds – 18V/20V drills, impacts, circular saws.
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DIY High-Current Projects – Power banks, inverters, portable workstations.
FAQ
Q: 45A continuous — really?
A: Yes. Molicel rates it for 45A continuous, and independent testing backs it up. It's the benchmark for high-drain 21700s.
Q: Unprotected? Isn't that risky?
A: Only if you misuse it. Pair it with a quality 4.2V charger and devices with built-in low-voltage cutoff (all modern high-performance gear has this). The cell's PTC, vent, and CID add passive safety.
Q: Flat top only?
A: Yes. Flat top is the universal standard for high-drain applications — tighter fit, lower resistance, better for welding.
Q: Can I use this in an 18650 device?
A: No. 21700 is larger. Your device must explicitly support 21700.
Q: How do I store the spare?
A: 3.6–3.7V (~50% charge) in a plastic case. Check every 3 months.
