{"product_id":"samsung-inr21700-50g-5000mah-high-capacity-21700-battery-4-piece-set-with-nitecore-ums4-smart-charger","title":"Samsung INR21700-50G 5000mAh High-Capacity 21700 Battery 4-Piece Set with Nitecore UMS4 Smart Charger","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"6:1-6:19;167-185\"\u003eWhy This Bundle\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"8:1-8:609;187-795\"\u003eThe Samsung 50G is a high-energy 21700 cell in the same general class as the 50E — a genuine 5000mAh capacity with a 9.8A continuous discharge rating (up to 14.7A in short pulses), built for runtime-focused applications rather than extreme current draw. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine Samsung INR21700-50G batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"12:1-12:39;802-840\"\u003eSamsung INR21700-50G Specifications\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"14:1-28:107;842-1534\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eItem\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eModel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eSamsung INR21700-50G (Flat Top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Discharge Capacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e5000mAh (4900mAh minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.63V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e9.8A (14.7A pulse, not for continuous use)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eStandard Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.45A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eMaximum Charge Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.9A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCharge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDischarge Cutoff Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eChemistry\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLi-ion, energy-focused\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCell Size\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e21700 (approx. Φ21.1mm × 70.15mm, max weight 69.5g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTerminal Type\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFlat Top only (slightly recessed top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eProtection Circuit\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eNone (unprotected cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTypical Use\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eE-bikes, power tools, energy storage systems, robotics, professional battery pack builds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"30:1-30:182;1536-1717\"\u003e\u003cem\u003eNote: This cell is an energy\/runtime-focused 21700, similar in profile to the Samsung 50E — built for moderate, sustained current draw rather than extreme high-drain applications.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"32:1-32:182;1719-1900\"\u003e\u003cem\u003eThis is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"36:1-36:30;1907-1936\"\u003eThe Charger: NITECORE UMS4\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"38:1-46:95;1938-3112\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"38:1-38:179;1938-2116\"\u003e\n\u003cstrong\u003eUSB-C input with QC support\u003c\/strong\u003e: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter — the closest match here to the 50G's 2.45A standard charge current\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"39:1-39:109;2117-2225\"\u003e\n\u003cstrong\u003eQC Mode output\u003c\/strong\u003e: 3,000mA×1 \/ 2,000mA×2 \/ 1,000mA×4 — \u003cstrong\u003eStandard Mode\u003c\/strong\u003e: 2,000mA×1 \/ 1,000mA×2 \/ 500mA×4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"40:1-40:121;2226-2346\"\u003e\n\u003cstrong\u003eIndependent 4-bay control\u003c\/strong\u003e: charge and monitor up to 4 batteries separately, with each bay unaffected by the others\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"41:1-41:202;2347-2548\"\u003e\n\u003cstrong\u003eDetailed real-time LCD display\u003c\/strong\u003e: shows battery health (Good\/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"42:1-42:116;2549-2664\"\u003e\n\u003cstrong\u003e3 automatic charging modes\u003c\/strong\u003e: CC, CV, and -dV\/dt, selected automatically based on battery type and charge level\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"43:1-43:88;2665-2752\"\u003e\n\u003cstrong\u003eManual adjustment\u003c\/strong\u003e: set charging voltage and current for specialized battery types\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"44:1-44:192;2753-2944\"\u003e\n\u003cstrong\u003eSafety features\u003c\/strong\u003e: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation\/restoration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"45:1-45:73;2945-3017\"\u003e\n\u003cstrong\u003eFire-retardant PC\/ABS housing\u003c\/strong\u003e with built-in temperature regulation\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"46:1-46:95;3018-3112\"\u003e\n\u003cstrong\u003eUniversal power input\u003c\/strong\u003e: works with wall adapters, power banks, and solar panels via USB-C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"50:1-50:53;3119-3171\"\u003eNITECORE UMS4 – Supported Battery Types \u0026amp; Voltage\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"52:1-52:147;3173-3319\"\u003e\u003cstrong\u003eCompatible with 3.6V\/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH\/Ni-Cd batteries\u003c\/strong\u003e, including the Samsung 50G (21700) in this bundle:\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"54:1-55:33;3321-3549\"\u003eIMR\/Li-ion\/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH\/Ni-Cd: AA, AAA, AAAA, C, D\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"57:1-57:68;3551-3618\"\u003e\u003cstrong\u003eOutput current:\u003c\/strong\u003e up to 3,000mA per bay (QC mode) \/ 4,000mA total\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"61:1-61:23;3625-3647\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"63:1-63:375;3649-4023\"\u003eThe UMS4 uses spring-loaded contacts and its bays are sized to comfortably fit 21700 cells like the 50G. Unlike a basic dual-slot travel charger, the UMS4's per-bay output (up to 3,000mA with a QC adapter on a single bay) lines up much more closely with the 50G's 2.45A standard charge current, making full charges considerably faster than a low-current charger would allow.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"65:1-65:223;4025-4247\"\u003e\u003cem\u003eNote: With all 4 bays occupied, each will charge more gently at up to 1,000mA (QC mode) or 500mA (standard mode) — still slower than the 50G's max 4.9A rating, but a reasonable, safe charging pace for four cells at once.\u003c\/em\u003e\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"69:1-69:19;4254-4272\"\u003eWhat's Included\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"71:1-74:18;4274-4387\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:35;4274-4308\"\u003eSamsung INR21700-50G Battery × 4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"72:1-72:34;4309-4342\"\u003eNITECORE UMS4 4-Bay Charger × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"73:1-73:27;4343-4369\"\u003eUSB-C Charging Cable × 1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"74:1-74:18;4370-4387\"\u003eUser Manual × 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"78:1-78:15;4394-4408\"\u003eSafety Tips\u003c\/h2\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\" data-sourcepos=\"80:1-84:50;4410-4841\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"80:1-80:105;4410-4514\"\u003eStore batteries in a proper case, keeping them away from loose metal objects to prevent short circuits\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"81:1-81:63;4515-4577\"\u003eNever disassemble, puncture, burn, or submerge the batteries\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"82:1-82:75;4578-4652\"\u003eCharge only with a genuine, compatible charger such as the NITECORE UMS4\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"83:1-83:139;4653-4791\"\u003eThe 50G is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"84:1-84:50;4792-4841\"\u003eNever discharge below 2.5V or charge above 4.2V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"88:1-88:7;4848-4854\"\u003eFAQ\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"90:1-91:279;4856-5200\"\u003e\u003cstrong\u003eQ: Can the NITECORE UMS4 charge Samsung 50G batteries safely?\u003c\/strong\u003e A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50G cells, with real-time monitoring on its LCD display, and its higher per-bay output charges these cells noticeably faster than a basic low-current charger.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"93:1-94:278;5202-5523\"\u003e\u003cstrong\u003eQ: How does the 50G compare to the 50E?\u003c\/strong\u003e A: The two are very close in profile — both 5000mAh-class cells with similar continuous discharge ratings (50G: 9.8A continuous\/14.7A pulse; 50E: 9.8A). Independent testing has found the 50E slightly edges out the 50G in raw capacity, while both deliver similar overall energy.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"96:1-97:188;5525-5766\"\u003e\u003cstrong\u003eQ: Can I charge all 4 batteries at the same time?\u003c\/strong\u003e A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"99:1-100:122;5768-5943\"\u003e\u003cstrong\u003eQ: Will 21700 batteries fit properly in the UMS4?\u003c\/strong\u003e A: Yes. The UMS4's bays and spring-loaded contacts are sized to accommodate 21700 cells like the 50G without any adapter.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"102:1-103:173;5945-6168\"\u003e\u003cstrong\u003eQ: How do I know if a 50G battery is degraded?\u003c\/strong\u003e A: The UMS4's LCD display shows battery health as \"Good\" or \"Poor\" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"105:1-106:96;6170-6328\"\u003e\u003cstrong\u003eQ: Can I power the UMS4 with a power bank while traveling?\u003c\/strong\u003e A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"108:1-109:105;6330-6460\"\u003e\u003cstrong\u003eQ: What's in the box?\u003c\/strong\u003e A: 4 Samsung INR21700-50G batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.\u003c\/p\u003e","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":51454225252598,"sku":"OAS1788","price":95.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/nitecore-ums4-samsung-50g-flat-top-4pack-set-main_fb0ba845-3428-411e-93f1-0f8cd41a5f6c.webp?v=1786968748","url":"https:\/\/oneandes.com\/products\/samsung-inr21700-50g-5000mah-high-capacity-21700-battery-4-piece-set-with-nitecore-ums4-smart-charger","provider":"OneAndes","version":"1.0","type":"link"}