{"product_id":"samsung-35e-18650-battery-4-pack-button-top-free-shipping","title":"Samsung 35E 18650 Battery 3500mAh 8A - Button Top (4-Pack) - Free Shipping","description":"\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=\"\"\u003eGenuine Samsung Core + Professional Button Top:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Each cell starts as an authentic INR18650-35E flat top.\u003c\/span\u003e\u003cspan class=\"\"\u003e We equip it with a sturdy, low-resistance button top welded using industry-leading techniques for maximum durability and performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMassive 3500mAh Capacity:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Typical capacity of 3500mAh (3350mAh min) means dramatically extended runtime in flashlights, headlamps, vaporizers, and portable electronics.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e8A Continuous Discharge Rate:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Safely delivers up to 8A continuous (13A pulse), perfectly suiting regulated mods with builds above 0.5 ohms, high-output LED torches, and power tools with moderate current demand.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUniversal Button Top Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Works right out of the box in devices with physical reverse-polarity protection, recessed positive contacts, and dual-spring battery tubes.\u003c\/span\u003e\u003cspan class=\"\"\u003e Say goodbye to unreliable magnet spacers.\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 Added Resistance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e The welded button top raises internal resistance by under 2mΩ, keeping total IR ≤25mΩ.\u003c\/span\u003e\u003cspan class=\"\"\u003e Expect no additional voltage sag or heating compared to a native flat top.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eLong Cycle Life \u0026amp; Value:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e ≥500 charge\/discharge cycles (to 70% capacity) under standard conditions, lowering total cost of ownership and replacement frequency.\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 Cell for Flexibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e No built-in protection PCB means you can integrate a custom BMS for pack building or use the cells directly in devices that already have low-voltage cutoff and overcurrent safeguards.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eNo Memory Effect \u0026amp; Easy Maintenance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Charge anytime without full discharge; Li-ion chemistry stays efficient and ready.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFree Shipping \u0026amp; Secure Packaging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e The 4-pack ships free with protective individual cell separation, making it an affordable, risk-free addition to your battery stock.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eRetained Native Safety Features:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Despite the welded cap, the cell’s internal CID, PTC, and vent mechanism remain fully functional and unaltered.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cstrong\u003eThis is button‑top | Need flat‑top? \u003ca href=\"https:\/\/oneandes.com\/product\/samsung-35e-18650-battery-4-pack-flat-top-free-shipping\/\"\u003eClick here\u003c\/a\u003e\u003c\/strong\u003e\u003c\/h5\u003e\u003cbr\u003e \u003cbr\u003e\u003ch2\u003e\u003cspan class=\"\"\u003eParameters\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\u003cdiv class=\"ds-scroll-area__gutters\"\u003e\n\u003cdiv class=\"ds-scroll-area__horizontal-gutter\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"ds-scroll-area__vertical-gutter\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cspan class=\"\"\u003e66.5mm (original flat top 64.85mm + ~1.7mm)\u003c\/span\u003e\u003cspan class=\"\"\u003eWeight (approx. per cell)\u003c\/span\u003e\u003cspan class=\"\"\u003e~51g\u003c\/span\u003e\u003cspan class=\"\"\u003eCharge Temperature\u003c\/span\u003e\u003cspan class=\"\"\u003e0℃ to 50℃ (32°F to 122°F)\u003c\/span\u003e\u003cspan class=\"\"\u003eDischarge Temperature\u003c\/span\u003e\u003cspan class=\"\"\u003e-20℃ to 60℃ (-4°F to 140°F)\u003c\/span\u003e\u003cspan class=\"\"\u003eStorage Temperature (1 month)\u003c\/span\u003e\u003cspan class=\"\"\u003e-20℃ to 50℃\u003c\/span\u003e\u003cspan class=\"\"\u003eStorage Temperature (3 months)\u003c\/span\u003e\u003cspan class=\"\"\u003e-20℃ to 45℃\u003c\/span\u003e\u003cspan class=\"\"\u003eRecommended Storage Voltage\u003c\/span\u003e\u003cspan class=\"\"\u003e3.6V–3.7V (~40–60% state of charge)\u003c\/span\u003e\u003cspan class=\"\"\u003ePackage Contents\u003c\/span\u003e\u003cspan class=\"\"\u003e4 x Samsung 35E 18650 Button Top batteries\u003c\/span\u003e\u003cspan class=\"\"\u003eShipping\u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFree shipping: 8-17 business days to US (tracking included).\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003cbr\u003e\u003ctbody\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\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eBase Cell Model\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eINR18650-35E (Samsung SDI)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eProduct Variation\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eSamsung 35E 18650 Button Top (custom positive cap)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eSamsung SDI \/ button top assembly by specialized lab\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eTypical Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3500mAh (0.2C discharge to 2.65V)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMinimum Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e3350mAh\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\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eCharge Termination Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e4.20V ±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=\"\"\u003e2.65V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Continuous Discharge Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e8A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eMax Pulse Discharge Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e13A\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=\"\"\u003e0.5C (1700mA)\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=\"\"\u003e1C (3350mA, 0.5C recommended for longevity)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eInternal Resistance (AC 1kHz)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e≤25mΩ (typical fresh with cap: 20–23mΩ)\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 (0.5C charge \/ 1C discharge, ≥70% capacity)\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=\"\"\u003eLi-ion NCA (Nickel Cobalt Aluminum Oxide)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePositive Terminal Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eButton Top (raised positive)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eButton Cap Material\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003ePure nickel \/ stainless steel, ultrasonically\/resistance welded\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\u003cspan class=\"\"\u003eNone (unprotected cell, button top only)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eDiameter (max)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003e18.33mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eHeight (max, incl. button)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan class=\"\"\u003eApprox.\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003cbr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eApplications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eHigh-Performance Flashlights \u0026amp; Searchlights:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Specifically for brands and models that demand button top cells due to physical reverse-polarity rings or recessed springs, such as Surefire, Fenix, Nitecore, and Olight. Enjoy stable, high-mode output without flickering.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eMedical \u0026amp; Industrial Handhelds:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Portable infusion pumps, patient monitors, handheld data terminals, and RFID scanners frequently employ button-top-positive battery bays.\u003c\/span\u003e\u003cspan class=\"\"\u003e These cells are a drop-in solution for continuous, reliable operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eWireless \u0026amp; Digital Devices:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Use in wireless security cameras, digital audio recorders, portable scanners, and upgraded RC transmitter packs (Futaba\/JR-style) where the battery tray is designed for a raised positive terminal.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eToys \u0026amp; STEM Kits:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Many motorized toy and educational robot kits require button top 18650s for proper contact.\u003c\/span\u003e\u003cspan class=\"\"\u003e The 4-pack keeps the fun running and provides spares for high-drain 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=\"\"\u003eSolar \u0026amp; Camping Lights:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Outdoor lanterns, solar path lights, and tent lamps often utilize 2S tray holders that rely on button tops for series connection.\u003c\/span\u003e\u003cspan class=\"\"\u003e Long cycle life means seasons of maintenance-free operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eUser-Serviceable Power Bank Enclosures:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Certain DIY power bank cases only recognize batteries with a button top.\u003c\/span\u003e\u003cspan class=\"\"\u003e Build a compact 14,000mAh portable charger by dropping these four cells in parallel.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eEmergency \u0026amp; Backup Power:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e Pre-build swappable battery cartridges with button top contacts for emergency lights or portable power stations.\u003c\/span\u003e\u003cspan class=\"\"\u003e High energy density ensures long standby and runtime.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003ePack Building Caution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e If you intend to spot-weld these cells into a multi-cell battery pack, the protruding button top prevents the positive terminal from sitting flush with nickel strips, increasing the risk of bad welds or shorts. For pack assembly, we strongly recommend using our flat top version. Series connections must include a balancing BMS. Never solder directly onto cells.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan class=\"\"\u003eFAQ\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e1. Does this battery have a protection circuit? Is it just a button top on an unprotected cell?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eCorrect, it is an unprotected cell with a button top. There is no internal PCB that limits current or provides overcharge\/over-discharge protection. The button top is purely a physical positive terminal extension. The cell measures approximately 66.5mm in length, significantly shorter than typical protected button top cells (70mm+), fitting standard bays.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e2. Does Samsung manufacture the 35E as a button top originally? How is this made?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eSamsung SDI only produces the 35E in a flat top configuration. Our button top version is crafted by taking genuine Samsung flat top cells and welding a precision cap in a clean, controlled setting. We use solid-state bonding (ultrasonic or resistance welding)—absolutely no solder or conductive epoxy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e3. Will the welded button top increase internal resistance or affect performance?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eOur process adds negligible resistance (typically \u0026lt;2mΩ). The total IR of the finished cell remains well within the ≤25mΩ specification, and the 8A continuous discharge capability is unchanged. You will experience the same voltage response as the original flat top.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e4. Why should I choose the button top version over flat top?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eIf your device’s positive contact is recessed inside a physical reverse-polarity guard, or if it uses a flat spring but the terminal must protrude to reach, a flat top may not work at all. A button top makes a reliable, direct electrical connection without needing dangerous little magnets that can slip and short-circuit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e5. Will it fit all my 18650 devices?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eThe button top increases the cell height to around 66.5mm. It fits most devices designed to accept protected 18650s (up to 70mm). However, if your device has an extremely tight battery compartment and previously accepted a flat top with zero extra room, it might be too long. Please measure your battery cavity or consult your device manual.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e6. Can I spot-weld or solder to the button top for pack building?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eWe do not recommend it. The raised top makes it difficult to achieve a flat contact for nickel strips, and heat from soldering or misaligned welding probes can damage the cell. For pack construction, please order the flat top version instead.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e7. What charger is compatible with button top cells? Do I need a special charger?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eAny standard, high-quality Li-ion charger (XTAR, Nitecore, Opus, Efest, etc.) with sliding negative contacts will accommodate button top cells without issue. The positive contact easily reaches the raised terminal. Always use a charger with reliable 4.2V termination.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e8. Are the 4 cells matched in capacity and IR?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eThey are sourced from the same production batch and have consistent voltage, but this product does not include precision matching. If you require tightly matched sets for series battery building, please contact us for a custom matching quote. A balancing BMS is still strongly recommended.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e9. How can I verify these are authentic Samsung cells underneath the cap?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eThe base flat top cell features all genuine Samsung hallmarks: crisp heat-shrink printing, a distinct embossed ring on the positive cap edge, and a raised, grey laser-etched code. Our button top cap is cleanly welded with a polished finish. We guarantee authenticity and offer a full refund if proven counterfeit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e10. Should I charge them upon arrival? How about storage?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eThey arrive at about 3.6V—the ideal storage voltage. You can use them immediately or store them as is. For long-term storage, keep them in a cool, dry place, and every 6–12 months check the voltage and recharge to 3.6–3.7V if needed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e11. Can I take these batteries on a flight?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eEach 35E is approximately 12.6Wh, for a total of about 50.4Wh across the 4-pack. This falls within the typical IATA carry-on allowance (under 100Wh). Always place each cell in an individual insulator (plastic case or tape over terminals) to prevent shorts. Check with your specific airline for any additional restrictions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003e12. How does free shipping work? What are the delivery times?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eFree standard shipping is automatically applied to this 4-pack. Orders are processed within 1–3 business days, and transit times typically range from 5–10 business days depending on your destination. You will receive a confirmation with tracking information once the order ships.\u003c\/span\u003e\u003c\/p\u003e\n\u003cstrong\u003e\u003cspan class=\"\"\u003e13. Flat Top vs. Button Top – Which one should I choose?\u003c\/span\u003e\u003c\/strong\u003e\n\u003cbr\u003e\u003cspan class=\"\"\u003eA: Choose \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eFlat Top\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e if you are spot welding battery packs, using devices with a flat spring contact, or building power banks. Choose \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eButton Top\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"\"\u003e if your device has a recessed positive terminal or a reverse-polarity protection ring (common in high-end flashlights ).\u003c\/span\u003e","brand":"Samsung","offers":[{"title":"Default Title","offer_id":51454213226742,"sku":"7931","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/samsung-35e-button-top-4pack-main_c8ab4083-06b0-4f1a-9197-0f9d09b04200.webp?v=1786968171","url":"https:\/\/oneandes.com\/products\/samsung-35e-18650-battery-4-pack-button-top-free-shipping","provider":"OneAndes","version":"1.0","type":"link"}