{"product_id":"nl1840r-18650-4000mah-6a","title":"NL1840R (18650 - 4000mAh - 6A)","description":"\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"rightvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122143232.webp\" alt=\"NL1840R - high performance USB-C rechargeable 18650 battery - Nitecore Singapore\"\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"lefttext\"\u003e\n\u003ch2\u003eAn 18650 that charges itself, straight from any USB-C cable.\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003eA 4,000mAh protected 18650 with a built-in USB-C port, so a power bank or a phone charger tops it up with no separate charger needed.\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4,000mAh, 3.6V, 14.4Wh of energy, roughly four times a CR123A\u003c\/li\u003e\n\u003cli\u003eBuilt-in USB-C port charges directly from a cable or a power bank\u003c\/li\u003e\n\u003cli\u003eRed light while charging, green when it is full\u003c\/li\u003e\n\u003cli\u003e6A maximum continuous discharge for high-drain lights\u003c\/li\u003e\n\u003cli\u003eIntelligent protected circuit plus a pressure-relief valve for safety\u003c\/li\u003e\n\u003cli\u003eRated for over 500 charge cycles, keeping more than 90% capacity\u003c\/li\u003e\n\u003cli\u003eThe exact cell that powers the Nitecore UT6 headlamp\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122336554.webp\" alt=\"NL1840R - built-in USB-C port with red and green charge indicator - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch2\u003eCharge it with the cable already in your bag.\u003c\/h2\u003e\n\u003cp\u003eThe USB-C port is built into the cell itself, so a wall charger, a laptop or a power bank brings it back to full. Pack one cable for your phone and the same one tops up this battery.\u003c\/p\u003e\n\u003cp\u003eA small light on the cell tells you where you stand. Red stays on while it charges, and it turns green the moment it is full, so you can leave it and check at a glance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"rightvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122477391.webp\" alt=\"NL1840R - dual charging by USB-C cable or external charger - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"lefttext\"\u003e\n\u003ch2\u003eTwo ways to charge, whichever suits the day.\u003c\/h2\u003e\n\u003cp\u003eCharge it in place over USB-C when you are travelling light, or drop it into a Nitecore charger when you are topping up a few cells at home. Both routes get you to a full battery.\u003c\/p\u003e\n\u003cp\u003eOn the trail or in a hotel room, plug it into a power bank and keep moving. The flexibility means you are never tied to one charger or one socket.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122247197.webp\" alt=\"NL1840R - 4000mAh capacity roughly four times a CR123A - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch2\u003e4,000mAh, about four times a CR123A.\u003c\/h2\u003e\n\u003cp\u003eWith 4,000mAh and 14.4Wh on board, this cell holds roughly four times the energy of a single CR123A. That is longer runtime per charge in a compatible light, and fewer swaps on a long night out.\u003c\/p\u003e\n\u003cp\u003eThe 6A maximum continuous discharge keeps high-drain lights fed at their brighter modes, so the output you bought for is the output you get.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003ch3 style=\"text-align: center; font-size: 24px; margin-bottom: 20px;\"\u003eWHY A SELF-CHARGING CELL OVER A STANDARD 18650 PLUS CHARGER\u003c\/h3\u003e\n\u003cdiv class=\"comparison-points\" style=\"display: flex; flex-wrap: wrap; justify-content: space-between; margin-bottom: 30px;\"\u003e\n  \u003cdiv style=\"flex-basis: 48%; margin-bottom: 15px; padding: 15px; border: 1px solid #eee; border-radius: 5px;\"\u003e\n    \u003cb\u003eNo separate charger to pack\u003c\/b\u003e\n    \u003cp\u003eThe USB-C port is in the cell, so any cable you already carry tops it up. A standard 18650 needs its own dock to come back to life.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex-basis: 48%; margin-bottom: 15px; padding: 15px; border: 1px solid #eee; border-radius: 5px;\"\u003e\n    \u003cb\u003eTop up from a power bank\u003c\/b\u003e\n    \u003cp\u003eRun a cable from a pocket power bank and refill it anywhere. An ordinary cell waits until you are back at a mains socket.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex-basis: 48%; margin-bottom: 15px; padding: 15px; border: 1px solid #eee; border-radius: 5px;\"\u003e\n    \u003cb\u003eProtected and built to last\u003c\/b\u003e\n    \u003cp\u003eAn intelligent protected circuit, a pressure-relief valve and steel end protectors guard every charge. Many bare cells ship with none of this.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex-basis: 48%; margin-bottom: 15px; padding: 15px; border: 1px solid #eee; border-radius: 5px;\"\u003e\n    \u003cb\u003eA charge state you can read\u003c\/b\u003e\n    \u003cp\u003eThe red and green indicator shows charging and full at a glance, so you load a known-full cell. A plain battery leaves you guessing.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section-tech\"\u003e\n\u003ch3 style=\"text-align: center; font-size: 24px; margin-bottom: 20px;\"\u003eA MULTI-LAYER PROTECTION SYSTEM\u003c\/h3\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122565244.webp\" alt=\"NL1840R - purpose-designed high performance protection IC - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003cp\u003eInside the cell sits an intelligent protected circuit built around a purpose-designed, high-performance protection IC. It guards against overcharge, over-discharge and short-circuit, while a high-power MOS-FET regulates current under load.\u003c\/p\u003e\n\u003cp\u003eThe result is steady, dependable power on every cycle, whether the cell is feeding a bright light or sitting on charge overnight.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122517323.webp\" alt=\"NL1840R - internal safety features with pressure-relief valve - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch2\u003eBuilt-in safeguards, inside and out.\u003c\/h2\u003e\n\u003cp\u003eA pressure-relief valve responds to a rapid rise in temperature, releasing internal pressure to keep the cell stable in demanding use. It is the kind of safeguard you want and rarely think about.\u003c\/p\u003e\n\u003cp\u003eTogether with the protected circuit, these internal features mean the battery looks after itself through hard use and long storage alike.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"rightvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122763230.webp\" alt=\"NL1840R - external nickel-plated stainless-steel protectors and metallic film - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"lefttext\"\u003e\n\u003ch2\u003eA tough shell that handles daily carry.\u003c\/h2\u003e\n\u003cp\u003eNickel-plated stainless-steel protectors cap both ends of the cell, shielding the contacts from knocks and wear in a pack or a pocket. A durable metallic film wraps the body to resist abrasion.\u003c\/p\u003e\n\u003cp\u003eIt is a cell that takes the rough handling of everyday carry and keeps a clean, reliable connection in your light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511122895441.webp\" alt=\"NL1840R - over 500 charge cycles with 90 percent capacity retention, mercury and lead free - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch2\u003eOver 500 cycles, with energy to spare.\u003c\/h2\u003e\n\u003cp\u003eRated for more than 500 full charge cycles, this cell still holds over 90% of its capacity after 500 rounds. Charge it most days and it keeps delivering for a long time before it fades.\u003c\/p\u003e\n\u003cp\u003eIt is made mercury-free, lead-free and cadmium-free, so a long-life battery is also a cleaner one to live with and dispose of.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003ch3 style=\"text-align: center; font-size: 24px; margin-bottom: 20px;\"\u003eWHERE THE NL1840R EARNS ITS PLACE\u003c\/h3\u003e\n\u003cdiv class=\"usage-scenarios\" style=\"display: flex; flex-wrap: wrap; justify-content: space-between; margin-bottom: 30px;\"\u003e\n  \u003cdiv class=\"usage-item\" style=\"width: 23%; margin-bottom: 20px; padding: 15px; text-align: center; border: 1px solid #eee; border-radius: 5px; box-sizing: border-box;\"\u003e\n    \u003cb\u003eFlashlight Owners\u003c\/b\u003e\n    \u003cp style=\"font-size: 14px;\"\u003eA high-capacity 6A cell that keeps a compatible 18650 light running bright, then recharges from any USB-C cable.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"usage-item\" style=\"width: 23%; margin-bottom: 20px; padding: 15px; text-align: center; border: 1px solid #eee; border-radius: 5px; box-sizing: border-box;\"\u003e\n    \u003cb\u003eHeadlamp \u0026amp; UT6 Owners\u003c\/b\u003e\n    \u003cp style=\"font-size: 14px;\"\u003eThe exact cell that powers the Nitecore UT6 headlamp, ready to refill hands-free over USB-C between runs.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"usage-item\" style=\"width: 23%; margin-bottom: 20px; padding: 15px; text-align: center; border: 1px solid #eee; border-radius: 5px; box-sizing: border-box;\"\u003e\n    \u003cb\u003eEDC \u0026amp; Preparedness\u003c\/b\u003e\n    \u003cp style=\"font-size: 14px;\"\u003eA protected spare you can keep topped up from a power bank, ready in a kit or a go-bag using just a USB-C cable.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"usage-item\" style=\"width: 23%; margin-bottom: 20px; padding: 15px; text-align: center; border: 1px solid #eee; border-radius: 5px; box-sizing: border-box;\"\u003e\n    \u003cb\u003eTravelling Light\u003c\/b\u003e\n    \u003cp style=\"font-size: 14px;\"\u003eLeave the charger at home and refill the cell in place, using the same USB-C cable that charges your phone.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511123111558.webp\" alt=\"NL1840R - compatible Nitecore UMS4, UMS2, Ci4 and Ci2 chargers - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch2\u003eDrops into your Nitecore chargers.\u003c\/h2\u003e\n\u003cp\u003eWhen you prefer a dock, the NL1840R works in the Nitecore UMS4, UMS2, Ci4 and Ci2 chargers. Charge it alongside your other cells in a multi-bay charger at the bench.\u003c\/p\u003e\n\u003cp\u003eSo you have it both ways. Charge in place over USB-C when you are out, or top up a row of cells in a charger when you are home.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section-tech\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003ch4\u003eSPECIFICATIONS\u003c\/h4\u003e\n\u003ctable id=\"details_table\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\" width=\"45%\"\u003eChemistry\u003c\/td\u003e\n\u003ctd\u003eLi-ion (protected 18650, button-top)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e4,000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e3.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eEnergy\u003c\/td\u003e\n\u003ctd\u003e14.4Wh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eMax Continuous Discharge\u003c\/td\u003e\n\u003ctd\u003e6A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eCharging\u003c\/td\u003e\n\u003ctd\u003eBuilt-in USB-C port, or external charger\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eCharge Indicator\u003c\/td\u003e\n\u003ctd\u003eRed charging \/ green full\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eIntelligent protected circuit, pressure-relief valve, steel end protectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eCycle Life\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;500 cycles, \u0026gt;90% capacity retained\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e18.5mm ±0.3 dia × 71.0mm ±0.3 length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e51g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch4\u003eCOMPATIBLE CHARGERS \u0026amp; CERTIFICATIONS\u003c\/h4\u003e\n\u003ctable id=\"details_table\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\" width=\"45%\"\u003eCompatible Chargers\u003c\/td\u003e\n\u003ctd\u003eNitecore UMS4, UMS2, Ci4, Ci2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eDirect Charging\u003c\/td\u003e\n\u003ctd\u003eAny USB-C cable, including from a power bank\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eMercury-free, lead-free, cadmium-free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eEnd Protectors\u003c\/td\u003e\n\u003ctd\u003eNickel-plated stainless steel, both ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eBody Wrap\u003c\/td\u003e\n\u003ctd\u003eDurable metallic anti-abrasion film\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eCE and further global certifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd id=\"details_head\"\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e12 months\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003ch3 style=\"text-align: center; font-size: 24px; margin-bottom: 20px;\"\u003eFREQUENTLY ASKED QUESTIONS\u003c\/h3\u003e\n\u003cdiv style=\"max-width: 800px; margin: 0 auto;\"\u003e\n  \u003cdiv style=\"border-bottom: 1px solid #e5e5e5; padding-bottom: 25px; margin-bottom: 30px;\"\u003e\n    \u003cb\u003eWill it fit my light that takes a 65mm 18650?\u003c\/b\u003e\n    \u003cp\u003eCheck the length. The NL1840R is 71.0mm long, where a standard 18650 is around 65mm. The extra length houses the built-in USB-C port, so a device built for exactly 65mm cells may be a tight fit or may not close. It works in compatible Nitecore lights and chargers, and it is the exact cell used in the Nitecore UT6 headlamp. If your light specifies a 65mm cell, measure the battery bay before ordering.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border-bottom: 1px solid #e5e5e5; padding-bottom: 25px; margin-bottom: 30px;\"\u003e\n    \u003cb\u003eDo I still need a separate charger?\u003c\/b\u003e\n    \u003cp\u003eNo. The USB-C port is built into the cell, so any USB-C cable charges it directly, including one running from a power bank. If you already own a Nitecore UMS4, UMS2, Ci4 or Ci2, the cell works in those too, so you can use whichever is handier.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"padding-bottom: 25px; margin-bottom: 30px;\"\u003e\n    \u003cb\u003eHow do I know when it is fully charged?\u003c\/b\u003e\n    \u003cp\u003eWatch the indicator on the cell. It glows red while charging and turns a steady green once the battery is full, so you can leave it on charge and check the colour at a glance.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\n\u003cdiv class=\"prodwrap-section\"\u003e\n\u003cdiv class=\"leftvideo\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511200345808.png\" alt=\"NL1840R - 18650 battery with built-in USB-C port - Nitecore Singapore\"\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"righttext\"\u003e\n\u003ch3\u003eWhat's In The Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e1x NL1840R 18650 Battery\u003c\/b\u003e - 4,000mAh protected Li-ion cell with built-in USB-C charging port\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"margin-top: 20px;\"\u003eA self-charging 18650 that keeps your light ready and your charger at home.\u003c\/h3\u003e\n\u003ca href=\"#\" class=\"btn\" style=\"display: inline-block; padding: 12px 24px; background-color: #03ae78; color: white; text-decoration: none; font-weight: bold; border-radius: 4px; font-size: 18px;\"\u003eGET YOUR NL1840R NOW\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n","brand":"Nitecore","offers":[{"title":"Default Title","offer_id":48340325040382,"sku":"NL1840RX1","price":59.0,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0207\/6514\/files\/2026061511200345808.png?v=1781762722","url":"https:\/\/www.nitecorelights.com\/products\/nl1840r-18650-4000mah-6a","provider":"Nitecore Singapore","version":"1.0","type":"link"}