{"product_id":"samsung-sdi-inr21700-40t-battery-4000mah-35a-10pcs-flat-top-button-top-welded-tabs-protected","title":"Samsung SDI INR21700-40T Battery 4000mAh 35A 10-Pack – Flat Top, Button Top, Spot Welded Tabs, Pre-Wired with Leads \u0026 Protected Top Options for E-Bikes, Power Tools, DIY Battery Packs","description":"\u003ch3\u003e\u003cspan class=\"\"\u003eDescription\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe Samsung SDI INR21700-40T is a high-power 21700 lithium-ion cell manufactured by Samsung SDI, with a nominal capacity of 4000mAh and a maximum continuous discharge current of 35A, peaking at 45A with 80°C temperature cut-off. Featuring a high-nickel ternary cathode and graphite anode, it delivers an energy density of approximately 206Wh\/kg and a power density of 2314W\/kg, balancing capacity and power output among comparable 21700 high-drain cells\u003c\/span\u003e\u003ca href=\"https:\/\/voltt.aboutenergy.io\/cell-library\/Samsung_40T\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThe 40T‘s core advantage lies in its stable high-rate discharge performance. Testing shows a full-charge internal resistance of approximately 10.55mΩ and an empty-charge resistance of 10.81mΩ, demonstrating excellent IR consistency\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e. At 0.2C discharge, actual capacity reaches 4037mAh with 14.81Wh energy output, reflecting solid capacity performance\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e. Under rigorous cycling at 6A charge \/ 35A discharge, capacity retention reaches approximately 60% after 250 cycles\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cspan class=\"\"\u003eThis product is available in five configurations: flat top, button top, spot welded tabs, pre-wired leads, and protected top. The 10-pack format supports applications ranging from DIY battery pack assembly to drop-in replacements. As a bare cell, the standard version requires a BMS-equipped system.\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNot suitable for vaping devices or consumer applications without protection circuits\u003c\/span\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/vera-baterie.pl\/en\/spot-welds\/102516-5203-samsung-cell-inr21700-40t-37v-4000-mah-spot-welded.html#\/127-cell_welds-yes\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"\"\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e4000mAh Nominal Capacity\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Standard capacity 4000mAh (0.5C), rated capacity 3900mAh (1.5C)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e35A Continuous \/ 45A Peak Discharge\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: 35A continuous without temperature cut; 45A with 80°C temperature protection\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\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\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Measured full-charge IR of ~10.55mΩ and empty-charge IR of ~10.81mΩ with excellent consistency\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eBalanced Energy and Power Density\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Gravimetric energy density ~206Wh\/kg, power density ~2314W\/kg\u003c\/span\u003e\u003ca href=\"https:\/\/voltt.aboutenergy.io\/cell-library\/Samsung_40T\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFive Configuration Options\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Flat top, button top, spot welded tabs, pre-wired leads, and protected top for different assembly scenarios\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10-Pack Bulk Packaging\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Ideal for pack assembly, repair replacements, and bulk spares\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"\"\u003eParameters\u003c\/span\u003e\u003c\/h3\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=\"\"\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eSamsung SDI\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eINR21700-40T\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=\"\"\u003eLi-ion (high-Ni cathode + graphite anode)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eSize\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e21700 (21.22mm diameter × 70.3mm height)\u003c\/span\u003e\u003ca href=\"https:\/\/www.tme.eu\/cn\/zh\/details\/accu-inr21700-40t\/ke-chong-dian-dian-chi\/samsung-sdi\/inr21700-40t\/\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStandard Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e4000mAh (0.5C, 2A charge \/ 800mA discharge to 2.5V)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eRated Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e3900mAh (1.5C, 6A charge \/ 10A discharge to 2.5V)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\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\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCharge Cut-off Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e4.2V\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\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\u003cspan class=\"\"\u003e35A (without temperature cut)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eTemperature-Cut Discharge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e45A (80°C cut-off)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eStandard Charge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003eCCCV, 2A, 4.20V, 200mA cut-off\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eRated Charge\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003eCCCV, 6A, 4.20V, 100mA cut-off\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\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\n\u003cspan class=\"\"\u003e~10.5–10.8mΩ (measured)\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\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\n\u003cspan class=\"\"\u003e~68–70g\u003c\/span\u003e\u003ca href=\"https:\/\/www.tme.eu\/cn\/zh\/details\/accu-inr21700-40t\/ke-chong-dian-dian-chi\/samsung-sdi\/inr21700-40t\/\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/voltt.aboutenergy.io\/cell-library\/Samsung_40T\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eEnergy Density\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e~206Wh\/kg (gravimetric) \/ 579Wh\/L (volumetric)\u003c\/span\u003e\u003ca href=\"https:\/\/voltt.aboutenergy.io\/cell-library\/Samsung_40T\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\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\n\u003cspan class=\"\"\u003e≥2400mAh after 250 cycles (6A charge \/ 35A discharge, 60% retention)\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eOperating Temperature (Charge)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cspan class=\"\"\u003e0°C ~ 50°C\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-17.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eVersion\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eFlat Top \/ Button Top \/ Spot Welded Tabs \/ Pre-Wired \/ Protected Top\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePack Quantity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e10-Pack\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch3\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eE-Bikes and e-scooters\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: High power output for acceleration and hill climbing\u003c\/span\u003e\u003ca href=\"https:\/\/vera-baterie.pl\/en\/spot-welds\/102516-5203-samsung-cell-inr21700-40t-37v-4000-mah-spot-welded.html#\/127-cell_welds-yes\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePower tools\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Cordless drills, angle grinders, saws, and other high-drain tool battery packs\u003c\/span\u003e\u003ca href=\"https:\/\/vera-baterie.pl\/en\/spot-welds\/102516-5203-samsung-cell-inr21700-40t-37v-4000-mah-spot-welded.html#\/127-cell_welds-yes\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eEnergy storage systems\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Solar storage and UPS backup battery pack assembly\u003c\/span\u003e\u003ca href=\"https:\/\/riunet.upv.es\/server\/api\/core\/bitstreams\/f188eb79-9ff3-43cd-b141-33b00eea41bc\/content#17#16\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRobotics and industrial equipment\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Mobile devices requiring high-rate discharge\u003c\/span\u003e\u003ca href=\"https:\/\/vera-baterie.pl\/en\/spot-welds\/102516-5203-samsung-cell-inr21700-40t-37v-4000-mah-spot-welded.html#\/127-cell_welds-yes\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eDIY battery pack assembly\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e: Welded tabs and pre-wired versions for spot welding and quick connections\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNote: Not suitable for vaping devices, consumer electronics without protection circuits, or children’s toys\u003c\/span\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/vera-baterie.pl\/en\/spot-welds\/102516-5203-samsung-cell-inr21700-40t-37v-4000-mah-spot-welded.html#\/127-cell_welds-yes\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ1: What is the capacity of the 40T?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Standard capacity is 4000mAh (0.5C condition), with rated capacity of 3900mAh (1.5C condition). Measured 0.2C discharge capacity reaches 4037mAh\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ2: What is the maximum discharge current?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Maximum continuous discharge is 35A without temperature cut, reaching 45A with 80°C temperature protection\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-2.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ3: How is the internal resistance performance?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Measured full-charge IR is ~10.55mΩ and empty-charge IR is ~10.81mΩ, with nearly no difference between full and empty states—excellent consistency\u003c\/span\u003e\u003ca href=\"https:\/\/www.chongdiantou.com\/archives\/363327.html#1#1\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ4: What are the differences between flat top, button top, welded tabs, pre-wired, and protected versions?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Flat top suits standard battery compartments or spot-welding assembly. Button top fits spring-loaded contacts. Welded tabs are for direct spot-welding into packs. Pre-wired leads suit quick replacement or solder-free applications. Protected versions include built-in overcharge\/over-discharge\/short-circuit protection, suitable for single-cell use without a BMS.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ5: Does this cell have a protection circuit?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Standard, welded tab, and pre-wired versions are\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eunprotected bare cells\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003cspan\u003e \u003c\/span\u003eand must be used with a BMS or protected devices. Samsung officially requires second-level protection devices (PTC\/PCM) in battery pack designs\u003c\/span\u003e\u003ca href=\"https:\/\/riunet.upv.es\/server\/api\/core\/bitstreams\/f188eb79-9ff3-43cd-b141-33b00eea41bc\/content#17#16\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e. The protected top version includes built-in protection circuitry.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eQ6: How should I store the 10-pack?\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"\"\u003eA: Store in a cool, dry place (below 20°C, humidity below 65%), keep at approximately 40%–60% state of charge, and use insulating protective cases to prevent short circuits\u003c\/span\u003e\u003ca href=\"https:\/\/www.manualshelf.com\/manual\/samsung\/inr2170040t\/data-sheet-english\/page-17.html\" rel=\"noreferrer\" target=\"_blank\"\u003e\u003c\/a\u003e\u003cspan class=\"\"\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Samsung","offers":[{"title":"Flat Top","offer_id":51659586273526,"sku":"Oneandes55","price":82.98,"currency_code":"USD","in_stock":true},{"title":"Button Top","offer_id":51659586306294,"sku":"Oneandes56","price":83.98,"currency_code":"USD","in_stock":true},{"title":"Spot Welded Tabs","offer_id":51659586339062,"sku":"Oneandes57","price":83.98,"currency_code":"USD","in_stock":true},{"title":"Pre-wired with Leads","offer_id":51659586371830,"sku":"Oneandes58","price":83.98,"currency_code":"USD","in_stock":true},{"title":"Protected Top","offer_id":51659586404598,"sku":"Oneandes59","price":85.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/samsung-sdi-inr21700-40t-battery-4000mah-35a-10pcs-button-top-main.webp?v=1789636124","url":"https:\/\/oneandes.com\/products\/samsung-sdi-inr21700-40t-battery-4000mah-35a-10pcs-flat-top-button-top-welded-tabs-protected","provider":"OneAndes","version":"1.0","type":"link"}