{"product_id":"2-pack-21700-3-6-volt-rechargeable-battery-21700-battery-5000mah-flat-top-21700-li-ion-batteries-for-flashlight-headlamps-etc","title":"2-Pack Lishen 21700-5000SD 5000mAh 3.6V Flat Top Battery – 10A Continuous \/ 15A Pulse for LED Flashlights, Fans, Cameras \u0026 Toys","description":"\u003ch2\u003e\u003cspan class=\"\"\u003eThe Endurance Champion for Your Everyday Gear\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eWhy settle for a cell that forces you to choose between runtime and reliability? The\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLishen 21700-5000SD\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eis engineered for users who want both: a genuine\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e5000mAh capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ethat keeps devices running for hours on end, and a robust\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ewith\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e15A pulse\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ecapability to handle the demands of modern LED flashlights, portable fans, camera equipment, and motorized toys. This 2‑pack gives you the freedom to keep one cell in your device and one fully charged, eliminating downtime whether you're on a night hike, filming a wedding, or cooling down on a hot day.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eHonest Discharge Ratings — No Marketing Hype\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe 5000SD is rated for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, verified through stringent testing. This means it can sustain a steady 10‑amp load without voltage sag, overheating, or premature capacity loss — perfectly matched to the current draws of high‑performance single‑LED and multi‑LED flashlights, USB‑rechargeable fans, field monitors, and motorized toys. The\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e15A pulse\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ecapability provides an extra safety margin for instantaneous surges — the split‑second when a device's motor starts or a flashlight turbo mode engages. We don't inflate the numbers; we give you the real specifications so you can trust what you're buying.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFlat‑Top and Unprotected — The Universal Standard\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThis battery is supplied as an unprotected, flat‑top bare cell. The flush positive terminal measures exactly\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e70.0mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003efrom end to end, the industry standard for 21700‑compatible devices. It slides effortlessly into the tightest flashlight tubes, the recessed battery bays of portable fans, and the compact battery sleds of camera adapters and electronic toys. Omitting the external protection PCB reduces internal resistance by eliminating an unnecessary layer of circuitry — critical for maintaining voltage stability under load. Naturally, this design expects you to use a quality charger with precise 4.2V termination and to install the cell only in devices that feature built‑in low‑voltage cutoff. Every modern LED flashlight, USB‑rechargeable fan, camera accessory, and electronic toy on the market already incorporates this protection, making this cell a safe, drop‑in upgrade. The cell itself also includes a built‑in PTC thermistor, resealable safety vent, and CID for passive multi‑layered protection.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eWhere 5000mAh Transforms Your Experience\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe 5000mAh capacity stores approximately\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e18.5 watt‑hours\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eof energy — roughly 2.5 times what a standard 2000mAh 18650 can hold. In practical terms, a single 5000SD cell powers a 300‑lumen flashlight for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eover 5 hours\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eon medium mode, or an entire night on a low 50‑lumen setting. A USB desk fan on low speed hums for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10–12 hours\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, keeping your workspace comfortable through a full shift. A camera field monitor drawing a steady 1–3A runs for hours without a battery swap, letting you focus on the creative work rather than power management. Motorized toys — RC cars, robots, ride‑on vehicles — see dramatically extended playtime compared to standard 2000–3000mAh packs. And because you receive two identical cells, you can build a 2S pack for higher‑voltage applications, keep a spare fully charged for zero‑downtime operation, or simply have a backup always ready when you need it most.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eLong‑Life Chemistry and Robust Construction\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eLishen employs a high‑stability NMC (Nickel‑Manganese‑Cobalt) formulation that provides a flat 3.6V nominal discharge curve. With an internal resistance of\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e≤25mΩ\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, voltage sag at the full 10A is a minimal 0.25V — your flashlight beam stays bright, your fan speed stays constant, and your camera monitor doesn't flicker. The cell is rated for over\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e500 full charge\/discharge cycles\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003ewith at least 70% capacity retention, and its low self‑discharge rate allows you to store the spare cell for months at the recommended 3.6–3.7V without significant power loss. The nickel‑plated steel can resist corrosion, impact, and the everyday bumps of portable electronics. Built‑in passive safety layers — a PTC thermistor, a resealable safety vent, and a CID (Current Interrupt Device) — provide robust protection against over‑current, over‑pressure, and short circuits.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e5000mAh Genuine High Capacity (18.5Wh per cell)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eStores enough energy for 5+ hours of 300‑lumen flashlight light, 10–12 hours of fan cooling, or weeks of device standby. No more constant battery swaps.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10A Continuous \/ 15A Pulse Discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eVerified 10A continuous output handles medium‑drain devices with ease. 15A pulse provides extra headroom for motor startups and turbo mode surges.\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 all 21700‑compatible devices. Eliminates PCB resistance for more efficient 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=\"\"\u003eStable NMC Chemistry \u0026amp; Flat Discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eMaintains a consistent 3.6V nominal voltage from 4.2V down to 2.5V. Light output, fan speed, and motor torque stay predictable 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=\"\"\u003eLow Internal Resistance (≤25mΩ)\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eVoltage drop at 10A is only ~0.25V. Minimal energy lost as heat, maximum energy delivered to your device.\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 fade. Stores for months at 3.6–3.7V, always ready when you need it.\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 safety 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 bumps, drops, and daily wear of portable fans, flashlights, cameras, and toys.\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 uninterrupted power. Keep one in your device and one fully charged — ideal for long outings, back‑to‑back shoots, or all‑day job site use.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eTechnical Parameters\u003c\/span\u003e\u003c\/h2\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\u003cstrong\u003e\u003cspan class=\"\"\u003eBattery Model\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eLishen 21700-5000SD\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBattery Type\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003ePack Count\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eNominal Capacity per Cell\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e5000mAh (18.5Wh at 3.6V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNominal Voltage\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eFull Charge Voltage\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eDischarge Cut‑off Voltage\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eStandard Charge Current\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e2.5A (0.5C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMax Charge Current\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e5.0A (1C)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMax Continuous Discharge\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e10A (2C) — verified\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMax Pulse Discharge\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e15A (\u0026lt;5 seconds)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eInternal Resistance\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≤25mΩ (AC 1kHz, bare cell)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eProtection Circuit\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eNone — requires external over‑discharge protection\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePositive Terminal\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eFlat Top (flush) — no raised nipple\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDimensions per Cell\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eWeight per Cell\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox. 70g\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCycle Life per Cell\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eOperating Temp. (Charge)\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eOperating Temp. (Discharge)\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e-20°C to 60°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eStorage Temp. \u0026amp; Humidity\u003c\/span\u003e\u003c\/strong\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\u003cstrong\u003e\u003cspan class=\"\"\u003eChemistry\u003c\/span\u003e\u003c\/strong\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\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLED Flashlights \u0026amp; EDC Torches\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003ePerfect for single‑LED and multi‑LED lights that need maximum runtime. The 5000mAh capacity delivers 5+ hours of 300‑lumen medium light or a full night on low mode. The flat‑top design fits ultra‑tight enthusiast flashlight tubes (ZebraLight, Noctigon, Emisar) and spring‑loaded hosts alike.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePortable Fans for All‑Day Cooling\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eUSB desk fans, camping fans, stroller fans, and job‑site fans run 10–12 hours on low speed with this cell. The stable 10A output keeps airflow strong even on high settings. Flat top fits recessed fan battery bays perfectly.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCamera Monitors, Video Lights \u0026amp; Accessories\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eExternal field monitors, LED panels, and camera battery adapters that accept 21700 cells benefit from the massive capacity. Fewer battery swaps mean uninterrupted shooting — ideal for weddings, events, and long studio sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMotorized Toys \u0026amp; Ride‑On Vehicles\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eUpgrade RC cars, robots, and children's ride‑on toys with a 2S or 3S pack built from these cells. The 5000mAh capacity dramatically extends playtime, and the 10A discharge provides the current needed for startup surges and sustained driving.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDIY Power Banks \u0026amp; Hobby Electronics\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eThe flat‑top cell is ready for spot welding into custom 2S or 3S packs for high‑capacity USB‑C chargers, Bluetooth speakers, and portable power stations. Consistent 5000mAh capacity simplifies cell matching.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eSurveillance \u0026amp; Smart Home Devices\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eWireless cameras, doorbells, and motion sensors can run for weeks or months on a single charge. Low self‑discharge ensures reliability during long idle periods.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePortable Medical \u0026amp; Industrial Equipment\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eHandheld scanners, portable nebulizers, and thermal printers that rely on 21700 power appreciate the combination of long runtime and stable 10A output, ensuring consistent operation through extended shifts.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: Is the 15A rating continuous or pulse? What's the sustained discharge?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: The 15A rating is the\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003emaximum pulse discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003efor short bursts (under 5 seconds). The cell is rated for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e. We specify both figures honestly so you know exactly what to expect. For sustained 10A operation, the cell performs reliably without overheating or excessive voltage 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: Lishen designed the 5000SD as a bare cell for pack building and high‑capacity applications. A protection PCB would add unwanted length and resistance; a button top would interfere with tight compartments and spot welding. The flat‑top, unprotected design is the universal standard for enthusiast flashlights, fan bays, camera adapters, and DIY packs. It's safe when used with a quality 4.2V charger and in devices with built‑in low‑voltage cutoff — which virtually all modern electronics already feature. The cell's 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 used 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 electronic devices are designed specifically for flat‑top cells. 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,\" this cell is 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 × 70mm) 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.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: How long will a 5000mAh battery run my portable fan?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: On low speed (drawing about 0.4–0.5A), approximately 10–12 hours. On high speed (about 1.5–2A), around 3–4 hours. The 5000mAh capacity is nearly 2.5 times a standard 2000mAh 18650, providing a dramatic runtime improvement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ6: Can I charge this battery at 5A?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, 5A (1C) is the maximum charge current. For optimal cycle life, we recommend the standard 2.5A (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 18.5Wh, 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":"OneAndes","offers":[{"title":"Default Title","offer_id":51454114529526,"sku":"OAS183","price":16.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/2pack-21700-5000mAh-high-capacity-main_de19b6a7-7cf4-492f-ac2f-cfb40ddecca6.webp?v=1786965294","url":"https:\/\/oneandes.com\/products\/2-pack-21700-3-6-volt-rechargeable-battery-21700-battery-5000mah-flat-top-21700-li-ion-batteries-for-flashlight-headlamps-etc","provider":"OneAndes","version":"1.0","type":"link"}