{"product_id":"2-pack-21700-3-6v-rechargeable-batteries-21700-battery-3000mah-flat-top-batteries-for-flashlight-headlamps-etc","title":"2-Pack Lishen 21700 3000mAh 3.6V Flat Top Battery – High Drain Max 45A for Turbo Flashlights, RC Models \u0026 Power Tools","description":"\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eExtreme Current, No Compromises\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eWhen 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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2‑pack of Lishen 21700 high‑drain cells\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e is built for exactly those moments. Each cell packs a genuine \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3000mAh capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e and a terrifying \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e45A max pulse discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhy Lishen 21700 High‑Drain?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eLishen 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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e≤16mΩ\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, 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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e45A pulse\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e capability provides an extra safety margin for split‑second startup spikes that would choke lesser cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFlat‑Top and Unprotected — The Enthusiast Standard\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eThis battery is purpose‑built with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eflat‑top positive terminal\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e70.0mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e — 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhere 3000mAh and 45A Shine\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eThe 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBuilt to Last, Even Under Stress\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eLishen employs high‑stability NMC chemistry, ensuring a flat 3.6V nominal discharge curve and excellent cycle life. The cell is rated for \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eover 500 full charge\/discharge cycles\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e45A Max Pulse \/ 35A Continuous High‑Drain\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eDelivers explosive current for turbo flashlights, RC models, and power tools. Sustained 35A output without voltage sag, with 45A pulse for startup spikes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3000mAh Genuine Capacity (10.8Wh per cell)\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eProvides meaningful runtime in high‑current applications. Enough for multiple RC heats, dozens of tool operations, or extended turbo bursts.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUnprotected Flat‑Top Design\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eStandard 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUltra‑Low Internal Resistance (≤16mΩ)\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eVoltage drop at 35A is only ~0.56V. Minimal heat generation and sustained performance under heavy loads.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eStable NMC Chemistry\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eMaintains a flat 3.6V nominal voltage from 4.2V down to 2.5V. Predictable power output throughout the discharge.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e500+ Cycle Life \u0026amp; Low Self‑Discharge\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eRecharge hundreds of times with minimal capacity loss. Stores for months at 3.6–3.7V, always mission‑ready.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMulti‑Layered Passive Safety\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eBuilt‑in PTC thermistor, resealable vent, and CID protect against over‑current, over‑pressure, and short circuits.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRugged Nickel‑Plated Steel Can\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eCorrosion‑resistant and impact‑resistant. Handles the vibrations, drops, and harsh conditions of power tools, RC vehicles, and outdoor use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2‑Pack Value\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eTwo 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eTechnical Parameters\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"ds-scroll-area ds-scroll-area--show-on-focus-within ds-scroll-area--enabled _1210dd7 c03cafe9\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eParameter\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan class=\"\"\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eBattery Model\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eLishen 21700 3000mAh High Drain\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eBattery Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e21700 Li‑ion (unprotected, bare cell)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePack Count\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2 cells\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eNominal Capacity per Cell\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3000mAh (10.8Wh at 3.6V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eNominal Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3.6V (also commonly labeled 3.7V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eFull Charge Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e4.2V ± 0.05V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDischarge Cut‑off Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2.5V (use only with low‑voltage protected devices)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStandard Charge Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e1.5A (0.5C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Charge Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3.0A (1C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Continuous Discharge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003e35A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (approx. 11.7C) — sustained high drain\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Pulse Discharge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003e45A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (\u0026lt;3 seconds)\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eInternal Resistance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≤16mΩ (AC 1kHz, bare cell)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eProtection Circuit\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eNone\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e — requires external over‑discharge protection\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePositive Terminal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003eFlat Top (flush)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e — no raised nipple\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDimensions per Cell\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox. 21.2mm dia. × 70.0mm length\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eWeight per Cell\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox. 67g\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCycle Life per Cell\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≥500 cycles (≥70% initial capacity at 0.5C charge\/discharge)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eOperating Temp. (Charge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e0°C to 45°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eOperating Temp. (Discharge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e-20°C to 75°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStorage Temp. \u0026amp; Humidity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e-5°C to 35°C, \u0026lt;75% RH (recommend 3.6–3.7V storage)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eChemistry\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eNMC (Lithium Nickel Manganese Cobalt Oxide)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1. Turbo Flashlights \u0026amp; High‑Lumen Hot‑Rods\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eFor 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2. RC Cars, Trucks, Boats \u0026amp; Drones\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eBuild 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3. Cordless Power Tools (Rebuilds \u0026amp; Upgrades)\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eReplace 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e4. High‑Power Portable Fans \u0026amp; Cooling Devices\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eLarge 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e5. DIY High‑Current Power Banks \u0026amp; Portable Inverters\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eBuild 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e6. Electric Scooters \u0026amp; Light EVs (Small Packs)\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eFor 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: Is the 45A rating continuous or pulse? What’s the sustained current?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: The 45A rating is the \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003emaximum pulse discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e for very short bursts (under 3 seconds). The cell is rated for \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e35A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e. We specify both so you know exactly what to expect. For sustained 35A, the cell performs reliably without overheating or excessive sag.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: Why is this battery unprotected and only available as a flat top?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: Will this flat‑top cell work in a device that originally had a button‑top battery?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can I use these 21700 cells in a device designed for 18650?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: How hot does this cell get at 35A continuous?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ6: Can I charge these batteries at 3A?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ7: How should I store the spare cell?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ8: Can I bring these batteries on an airplane?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: 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.\u003c\/span\u003e\u003c\/p\u003e","brand":"Lishen","offers":[{"title":"Default Title","offer_id":51454113382646,"sku":"OAS182","price":15.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/2pack-21700-3000mAh-standard-main_dc7da34a-c21f-4377-9f02-7673855e4f81.webp?v=1786965292","url":"https:\/\/oneandes.com\/products\/2-pack-21700-3-6v-rechargeable-batteries-21700-battery-3000mah-flat-top-batteries-for-flashlight-headlamps-etc","provider":"OneAndes","version":"1.0","type":"link"}