2-Pack Lishen 21700 3000mAh 3.6V Flat Top Battery – High Drain Max 45A for Turbo Flashlights, RC Models & Power Tools

Product Description

Extreme Current, No Compromises
When your device demands a brutal surge of power — a turbo flashlight hitting 8000 lumens, a 1/8 scale RC truggy rocketing out of a corner, or a cordless impact wrench hammering stubborn bolts — you need a battery that delivers every single amp without flinching. This 2‑pack of Lishen 21700 high‑drain cells is built for exactly those moments. Each cell packs a genuine 3000mAh capacity and a terrifying 45A max pulse discharge, backed by a robust continuous rating that keeps your gear at full throttle. If you’ve ever felt your tools sag or your drone punch‑out fall flat, these flat‑top batteries are the cure.

Why Lishen 21700 High‑Drain?
Lishen is one of China’s premier lithium‑ion manufacturers, and this 21700 cell represents their dedication to high‑power applications. With an ultra‑low internal resistance of ≤16mΩ, voltage sag under load is virtually eliminated — at a full 35A continuous draw, the drop is only 0.56V. That means your turbo flashlight maintains its retina‑searing brightness, your RC motor doesn’t bog on acceleration, and your power tool spins at full torque when you need it most. The 45A pulse capability provides an extra safety margin for split‑second startup spikes that would choke lesser cells.

Flat‑Top and Unprotected — The Enthusiast Standard
This battery is purpose‑built with a flat‑top positive terminal and no external protection PCB. Why? Because high‑drain applications demand the shortest possible electrical path and the lowest possible resistance. The flush terminal mates perfectly with pogo‑pin contacts in drone battery sleds, recessed flat contacts in power tool packs, and nickel strips for spot‑welded custom builds. The unprotected design keeps the cell length at exactly 70.0mm — the industry standard — ensuring it drops effortlessly into the tightest flashlight tubes (Noctigon, Emisar, Convoy) and compact tool battery shells. Without a protection circuit to limit current or add length, you get pure, unfiltered power. Naturally, this requires you to use a quality charger with precise 4.2V termination and to install the cell only in devices that have built‑in low‑voltage cutoff — a feature present in all modern turbo flashlights, brushless power tools, and RC electronic speed controllers. The cell’s own PTC thermistor, resealable vent, and CID provide passive safety layers.

Where 3000mAh and 45A Shine
The 3000mAh capacity (about 10.8 watt‑hours) may not be the highest in the 21700 class, but it’s the perfect complement to the immense discharge capability. In a racing drone, this translates to explosive punch‑outs and hairpin turns without the weight penalty of larger cells. A cordless drill or impact driver rebuilt with these cells will snap stubborn screws loose with authority, and a single charge will still drive dozens of fasteners. An RC car will rip through a full race heat with relentless speed. Even in a DIY high‑current power bank, these cells can deliver the 5–10A needed for fast‑charging smartphones and tablets without breaking a sweat. And because you get two cells, you can build a 2S pack, swap on the fly, or keep a spare always ready.

Built to Last, Even Under Stress
Lishen employs high‑stability NMC chemistry, ensuring a flat 3.6V nominal discharge curve and excellent cycle life. The cell is rated for over 500 full charge/discharge cycles with at least 70% capacity retention. Low self‑discharge means you can store your spare cell at 3.6–3.7V for months without significant power loss. The nickel‑plated steel can shrugs off drops, vibrations, and the rough handling typical of power tools and RC vehicles. Built‑in passive safety — a PTC thermistor, a resealable safety vent, and a CID (Current Interrupt Device) — provides robust protection against over‑current, over‑pressure, and short circuits.

Key Features

• 45A Max Pulse / 35A Continuous High‑Drain
  Delivers explosive current for turbo flashlights, RC models, and power tools. Sustained 35A output without voltage sag, with 45A pulse for startup spikes.

• 3000mAh Genuine Capacity (10.8Wh per cell)
  Provides meaningful runtime in high‑current applications. Enough for multiple RC heats, dozens of tool operations, or extended turbo bursts.

• Unprotected Flat‑Top Design
  Standard 70.0mm length and flush positive terminal fit the tightest battery compartments. Eliminates PCB resistance for maximum power delivery. Requires a quality 4.2V charger and device with low‑voltage cutoff.

• Ultra‑Low Internal Resistance (≤16mΩ)
  Voltage drop at 35A is only ~0.56V. Minimal heat generation and sustained performance under heavy loads.

• Stable NMC Chemistry
  Maintains a flat 3.6V nominal voltage from 4.2V down to 2.5V. Predictable power output throughout the discharge.

• 500+ Cycle Life & Low Self‑Discharge
  Recharge hundreds of times with minimal capacity loss. Stores for months at 3.6–3.7V, always mission‑ready.

• Multi‑Layered Passive Safety
  Built‑in PTC thermistor, resealable vent, and CID protect against over‑current, over‑pressure, and short circuits.

• Rugged Nickel‑Plated Steel Can
  Corrosion‑resistant and impact‑resistant. Handles the vibrations, drops, and harsh conditions of power tools, RC vehicles, and outdoor use.

• 2‑Pack Value
  Two identical cells for zero‑downtime operation. Keep one in your device and one fully charged — ideal for back‑to‑back heats, long work shifts, or extended adventures.

Technical Parameters

Applications

1. Turbo Flashlights & High‑Lumen Hot‑Rods
For FET‑driven multi‑emitter flashlights, custom SBT90.2 builds, and any light that pulls 20–35A on turbo, these Lishen flat‑top cells provide the instantaneous current to keep lumens at maximum without early step‑down. The flush terminal is essential for ultra‑tight enthusiast flashlight tubes.

2. RC Cars, Trucks, Boats & Drones
Build a 2S or 3S Li‑ion pack for 1/10 and 1/8 scale vehicles, or a 4S/6S pack for racing drones. The 35A continuous output feeds brushless motors with brutal acceleration and top speed, while the 3000mAh capacity provides competitive runtimes. Flat‑top design allows clean, low‑profile spot welds.

3. Cordless Power Tools (Rebuilds & Upgrades)
Replace worn‑out cells in high‑torque drills, impact drivers, circular saws, and angle grinders. The high drain rate handles the 20–35A startup spikes of professional tools, and the 3000mAh capacity provides decent runtime for demanding tasks. Flat‑top is the standard for welding into 5S1P or 5S2P 18V/20V packs.

4. High‑Power Portable Fans & Cooling Devices
Large industrial fans or portable coolers that draw 10–20A run powerfully on these cells. The 3000mAh capacity provides strong airflow for hours on job sites or during outdoor events.

5. DIY High‑Current Power Banks & Portable Inverters
Build a compact power station capable of fast‑charging multiple devices or running a small AC inverter. The high discharge rate ensures stable output under heavy USB‑C or DC loads.

6. Electric Scooters & Light EVs (Small Packs)
For small electric scooters, hoverboards, or e‑bikes that use 21700 packs, these Lishen cells are an excellent choice for rebuilding with high‑performance current delivery.

FAQ

Q1: Is the 45A rating continuous or pulse? What’s the sustained current?
A: The 45A rating is the maximum pulse discharge for very short bursts (under 3 seconds). The cell is rated for 35A continuous discharge. We specify both so you know exactly what to expect. For sustained 35A, the cell performs reliably without overheating or excessive sag.

Q2: Why is this battery unprotected and only available as a flat top?
A: High‑drain cells like this Lishen 21700 are designed without a protection PCB to minimize length and internal resistance — both critical for high‑current applications. A button top would interfere with the tight battery tubes of enthusiast flashlights and complicate spot welding. The flat‑top, unprotected design is the universal standard for drones, power tool packs, and RC models. It is safe when used with a quality 4.2V charger and in devices with built‑in low‑voltage cutoff. The cell’s own PTC, vent, and CID provide passive protection.

Q3: Will this flat‑top cell work in a device that originally had a button‑top battery?
A: It depends on the device. Many high‑performance flashlights and tool packs are designed specifically for flat‑top cells because they offer lower resistance and a shorter overall length. If your device has a spring‑loaded positive contact with a physical reverse‑polarity ring, a button top may be required to make contact. Check your device manual; if it specifies “flat top” or “unprotected flat top,” these Lishen cells are the correct choice.

Q4: Can I use these 21700 cells in a device designed for 18650?
A: No. A 21700 cell (21mm diameter × 70mm length) is physically larger than an 18650 (18mm × 65mm). Your device must explicitly support the 21700 form factor. Never force a 21700 into an 18650 tube, as this can damage both the cell and the device.

Q5: How hot does this cell get at 35A continuous?
A: With an ultra‑low internal resistance of ≤16mΩ, heat generation is relatively well‑managed. The cell will become warm — typically reaching 65–75°C after several minutes of sustained 35A — but remains within safe operating limits. Allow the cell to cool between heavy discharge runs for best longevity.

Q6: Can I charge these batteries at 3A?
A: Yes, 3A (1C) is the maximum charge current. For optimal cycle life, we recommend the standard 1.5A (0.5C) rate. Fast charging generates more heat and may slightly reduce long‑term capacity.

Q7: How should I store the spare cell?
A: Keep it in a plastic battery case or silicone sleeve, away from metal objects and moisture. For storage longer than one month, bring the voltage to about 3.6–3.7V (roughly 50% charge). Check every 3 months and recharge if the voltage drops below 3.0V. Never store a fully depleted cell.

Q8: Can I bring these batteries on an airplane?
A: Yes. Each cell is approximately 10.8Wh, well under the 100Wh IATA limit for carry‑on luggage. Insulate the terminals and carry them in your hand luggage.