{"product_id":"delipow-21700-rechargeable-battery-48a-4000mah-large-capacity-3-6volt-21700-flat-top-battery-for-flashlights-ect","title":"Delipow 4000mAh 3.6V 21700 Flat Top Battery – High Drain Max 48A for Turbo Flashlights, RC Models \u0026 Power Tools","description":"\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eProduct Description\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUncompromising Flat‑Top Power for the Most Demanding Gear\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eWhen your equipment demands a brutal surge of current — a turbo flashlight burning at 5000 lumens, a 1\/8 scale RC truggy launching off the line, or a cordless impact wrench hammering lug nuts — you need a battery that delivers without hesitation. The Delipow 4000mAh 21700 flat‑top cell is engineered for exactly these moments. It offers a staggering \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e48A max pulse discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, backed by a robust \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e30A continuous\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e capability, all while storing a genuine \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e4000mAh\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (approximately 14.4 watt‑hours at 3.6V nominal). This is the no‑compromise choice for enthusiasts and professionals who refuse to let voltage sag rob their performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhy Flat‑Top and Unprotected?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eThis cell is purpose‑built as a bare, unprotected, flat‑top battery. We intentionally omit the external protection PCB to keep the overall length at the industry‑standard \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e70.0mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e — critical for fitting into the precisely machined battery tubes of high‑end flashlights, the compact shells of power tool packs, and the densely arranged sleds of RC battery trays. The flat‑top positive terminal sits completely flush with the cell body, making it the universal standard for pogo‑pin contacts, recessed flat PCB connections, and clean spot‑welding onto nickel strips. There is no raised button to interfere with tight‑fitting caps or to create uneven pressure during pack assembly. Removing the protection PCB also eliminates the extra electrical resistance that can limit current flow during high‑drain pulses, ensuring your devices get every last amp they demand. Of course, this design requires responsible use: you must pair this cell with a quality charger that terminates at exactly 4.2V, and you must only install it in devices that have built‑in low‑voltage cutoff. Virtually all modern turbo flashlights, brushless RC electronic speed controllers, and cordless tool motor controllers already incorporate this essential safety feature.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWhere 48A Pulse Power Makes the Difference\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eIn a FET‑driven turbo flashlight (such as an Emisar D4SV2, Noctigon K1, or a custom SBT90.2 hot‑rod), the Delipow cell instantly responds to the 20–35A demand of multiple high‑discharge LEDs, holding voltage rock‑steady so the beam never flickers and the thermal step‑down is dictated by heat, not electrical starvation. In a 1\/8 scale RC monster truck or a 1\/10 scale touring car, a 2S or 3S pack built from these flat‑top cells delivers brutal punch out of corners and relentless top‑end speed. The flat terminals weld seamlessly into stick packs, saddle packs, and drone battery configurations. For cordless power tools — high‑torque drills, impact drivers, and mini circular saws — the 30A continuous rating prevents motor stall under heavy load, while the 4000mAh capacity lets you drive dozens of screws or make multiple cuts before reaching for the charger. The flat‑top design is the standard for rebuilding 18V\/20V tool battery packs, where cells are spot‑welded in series.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eAdvanced Chemistry, Built to Last\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eDelipow’s NMC (Nickel‑Manganese‑Cobalt) formulation provides a stable 3.6V nominal voltage and an impressively flat discharge curve. With an internal resistance of only \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e≤16mΩ\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e, voltage sag at 30A is a mere 0.48V, meaning your devices stay in regulation and your performance remains predictable from a full charge down to the cutoff. The cell is rated for over \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e500 full charge\/discharge cycles\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e while retaining at least 70% of its original capacity, and its low self‑discharge rate allows you to store spares for months at the recommended 3.6–3.7V. Built‑in safety mechanisms — a \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePTC thermistor\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e that increases resistance during over‑current, a \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eresealable safety vent\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e that releases internal pressure in extreme conditions, and a \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eCID (Current Interrupt Device)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e that physically disconnects the electrode under catastrophic pressure — provide multiple layers of passive protection, ensuring safe operation even under the most extreme loads.\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=\"\"\u003eExtreme High‑Drain: 30A Continuous \/ 48A Max Pulse\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eFeeds power‑hungry turbo flashlights, RC models, and power tools without breaking a sweat. The 30A continuous rating keeps you at full power; the 48A pulse delivers headroom for instantaneous startup 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=\"\"\u003eGenuine 4000mAh Capacity (14.4Wh)\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eDelivers meaningful runtime in high‑current applications — roughly 10–15 minutes of continuous turbo in a flashlight, a full RC heat, or dozens of tool operations per charge.\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 — The Enthusiast Standard\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eFlush positive terminal fits the tightest battery tubes and recessed contacts. Eliminates the added length and resistance of a protection PCB. Requires a 4.2V Li‑ion charger and a device with built‑in 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 drops by only 0.48V at 30A. Minimal heat generation, maximum power delivery, and longer regulation for your devices.\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. Your light output, motor RPM, and tool torque stay predictable throughout the entire discharge cycle.\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 over 500 times with minimal capacity fade. Stays ready for months in storage at ~3.6–3.7V — always prepared for your next project or power outage.\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 internal 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. Built to withstand the vibrations, drops, and harsh conditions of power tools, RC vehicles, and outdoor environments.\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=\"\"\u003eDelipow 21700 4000mAh 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=\"\"\u003eNominal Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e4000mAh (14.4Wh 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=\"\"\u003e2.0A (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=\"\"\u003e4.0A (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=\"\"\u003e30A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e (7.5C) — 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=\"\"\u003e48A\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\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\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox. 68g\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCycle Life\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 Mods\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eFor FET‑driven, multi‑emitter, or custom SBT90.2 flashlights that pull 20–35A on turbo, this flat‑top cell provides the instantaneous current for maximum brightness without early step‑down. The flush terminal is essential for the tight battery tubes found in enthusiast lights.\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 or 1\/8 scale vehicles. The 30A continuous output feeds brushless motors with relentless acceleration and top speed, while the flat‑top design allows clean, low‑profile spot welds for professional‑grade packs.\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 drills, impact drivers, circular saws, and angle grinders. The high drain rate handles startup spikes and heavy loads, and the flat‑top terminal is the standard for welding into 5S1P or 5S2P packs for 18V\/20V platforms.\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 portable fans that draw 3–8A on high speed run powerfully and consistently. The flat top mates seamlessly with recessed contacts in many high‑output fan battery bays.\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 power station that can fast‑charge multiple devices or run a small AC inverter. The flat‑top cell is ready for spot welding into series\/parallel configurations without button‑top interference.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e6. Professional \u0026amp; Industrial Equipment\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003ePortable barcode scanners, thermal printers, and medical devices that require high‑current pulses for motors or actuators and dependable runtime are well‑served by this flat‑top 4000mAh cell.\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: Can this cell really handle 48A? What does \"Max 48A\" mean?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. The cell is rated for \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e30A continuous discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e and can safely pulse up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e48A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e for very short bursts (under 3 seconds). We specify both figures so you know exactly what to expect. For applications that demand a sustained 48A, you may need an ultra‑high‑rate cell like the Samsung 30T. This Delipow cell excels at delivering high continuous current with the ability to handle extreme instantaneous surges.\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 in flat top?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: This cell is designed specifically for high‑drain applications. A protection PCB would add unwanted length and internal resistance, potentially limiting current during peak loads. A button top would interfere with the tight battery tubes of many enthusiast flashlights and complicate spot welding. The flat‑top design is the universal standard for high‑performance devices. It is completely safe when used with a quality 4.2V charger and in devices that have built‑in low‑voltage cutoff. The cell itself includes passive safety layers (PTC, vent, CID).\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 flashlight that originally used a button‑top battery?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: It depends. Many high‑performance and enthusiast flashlights are designed for flat‑top cells because they offer lower resistance and a more compact fit. If your light has a spring‑loaded positive contact and a physical reverse‑polarity ring, a button top might be required to bridge the gap. Check your device manual: if it specifies \"flat top\" or \"unprotected flat top,\" this cell will work perfectly. If not, you may need a button‑top cell.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: Can I use this 21700 cell in a device that takes 18650 batteries?\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. Forcing a 21700 into an 18650 tube 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 battery get at 30A continuous?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: With an ultra‑low internal resistance of ≤16mΩ, heat generation is relatively modest. The cell will become warm — typically reaching around 60–70°C after several minutes of sustained 30A — but remains within safe operating limits. Allow the cell to cool between heavy discharge cycles for best longevity.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ6: Can I charge this battery at 4A?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes, 4A (1C) is the maximum charge current. However, for optimal cycle life, we recommend the standard 2A (0.5C) charge rate. Fast charging generates more heat and may slightly accelerate long‑term capacity fade.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ7: How should I store spare cells?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: Keep them 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 this battery on an airplane?\u003c\/span\u003e\u003c\/strong\u003e \u003cbr\u003e\u003cspan class=\"\"\u003eA: Yes. At approximately 14.4Wh, it is well under the 100Wh IATA limit for carry‑on luggage. Insulate the terminals with tape or a plastic case and carry the cells in your hand luggage.\u003c\/span\u003e\u003c\/p\u003e","brand":"DELIPOW","offers":[{"title":"Default Title","offer_id":51454095130870,"sku":"OAS171","price":7.28,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/delipow-21700-48A-4000mAh-flat-top-main_8feb0370-fffb-4b58-8299-f908fe8f508f.webp?v=1786965256","url":"https:\/\/oneandes.com\/products\/delipow-21700-rechargeable-battery-48a-4000mah-large-capacity-3-6volt-21700-flat-top-battery-for-flashlights-ect","provider":"OneAndes","version":"1.0","type":"link"}