{"product_id":"lg-inr18650-mj1-3500mah-10a-button-top-battery-4-pack-with-xtar-vc4sl-charger-high-capacity-long-run-power-kit-for-flashlights-power-stations-vapes","title":"LG INR18650-MJ1 3500mAh 10A Button Top Battery 4-Pack with XTAR VC4SL Charger – High-Capacity Long-Run Power Kit for Flashlights, Power Stations","description":"\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"5:1-5:25;153-177\"\u003eWhat's in This Bundle\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=\"7:1-9:91;179-353\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"7:1-7:43;179-221\"\u003e4x LG INR18650-MJ1, 3,500mAh, Button Top\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"8:1-8:41;222-262\"\u003e1x XTAR VC4SL 4-slot LCD USB-C charger\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"9:1-9:91;263-353\"\u003e1x Type-C QC3.0 fast-charge cable, storage pouch, and manual (included with the charger)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"11:1-11:233;355-587\"\u003eA complete kit for anyone running a 4-cell device or building a small pack — four matched, genuine high-capacity cells paired with a charger that does more than just charge: it tests, monitors, and reports on each cell individually.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"13:1-13:338;589-926\"\u003e\u003cstrong\u003eA note on Button Top length:\u003c\/strong\u003e converting the MJ1 to Button Top adds roughly 2mm to the cell's overall length compared to the native Flat Top version. This is standard for the conversion and shouldn't cause fit issues in devices designed for Button Top 18650s, but it's worth knowing if you're working with a tight battery compartment.\u003c\/p\u003e\n\u003cp data-sourcepos=\"13:1-13:338;589-926\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. Looking for Flat Top? \u003ca href=\"https:\/\/oneandes.com\/product\/lg-inr18650-mj1-3500mah-10a-flat-top-battery-4-pack-with-xtar-vc4sl-charger-high-capacity-power-bundle-for-edc-flashlights-camping-gear-portable-devices\/\"\u003eClick here to buy: LG INR18650-MJ1 Flat Top + XTAR VC4SL 4 Bundle.\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"15:1-15:32;928-959\"\u003eWhy This Pairing Makes Sense\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"17:1-17:586;961-1546\"\u003eThe MJ1 was, at release, one of the highest-capacity 18650 cells on the market — LG's NMC811 chemistry with a silicon-graphite anode pushes energy density further than most cells in this size while still holding a genuine 10A continuous discharge rating. Four cells bought together as a matched set means consistent capacity and internal resistance across the group — which matters more than usual here, since independent testing has shown some batch-to-batch capacity variability with this cell. Button Top is the terminal type required by devices with spring-loaded battery contacts.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"19:1-19:485;1548-2032\"\u003eThe XTAR VC4SL is a real step up from a basic charger: an LCD display showing live capacity, current, and internal resistance per slot, plus a capacity-test (grading) mode that charges, discharges, and recharges a cell to verify its actual capacity rather than just trusting the label. Given the batch variability noted below, this cell is a genuinely good candidate for that verification — you can confirm all four cells are performing consistently before you commit them to a build.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"21:1-21:35;2034-2068\"\u003eLG INR18650-MJ1 — Battery Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"23:1-39:79;2070-2826\"\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\"\u003eParameter\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\"\u003eValue\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\"\u003eBrand \u0026amp; Model\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eLG Chem INR18650-MJ1\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\"\u003eNMC811 cathode, graphite-silicon anode\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\"\u003eCapacity\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3,500mAh nominal (3,350mAh 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\"\u003e3.635V average\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\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e0.5C (1.675A) CC, 4.2V CV, 50mA cutoff\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 Charge Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V ±0.05V\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 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\"\u003e1.0C (~3.35A)\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\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e0.2C (670mA), 2.5V cutoff\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\"\u003e10A\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\"\u003eCycle Life\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e400 cycles (charge 1.5A \/ discharge 4A) to 80% capacity\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 Temperature\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e0°C to 45°C\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\"\u003eButton Top (+2mm length vs. 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\"\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\"\u003eWeight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e~49g max\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 Dimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDiameter 18.4mm (max 18.5mm), Height 65.0mm (max 65.2mm)\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=\"41:1-41:464;2828-3291\"\u003e\u003cstrong\u003eA note on real-world capacity:\u003c\/strong\u003e independent lab testing has shown this cell's actual measured capacity can run somewhat below its 3,500mAh nominal rating in some batches — one third-party comparison test measured roughly 3,205-3,384mAh depending on discharge rate, noticeably below the datasheet figure. This isn't unique to the MJ1, but it's a genuine reason to prioritize matched-batch, verified sets like this bundle over mixing cells from different orders.\u003c\/p\u003e\n\u003cp data-sourcepos=\"41:1-41:464;2828-3291\"\u003e\u003cstrong\u003e\u003cspan class=\"\"\u003eThis listing is for Button Top. For Flat Top\u003ca href=\"https:\/\/oneandes.com\/product\/lg-inr18650-mj1-3500mah-10a-flat-top-battery-4-pack-with-xtar-vc4sl-charger-high-capacity-power-bundle-for-edc-flashlights-camping-gear-portable-devices\/\"\u003e click here\u003c\/a\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"43:1-43:30;3293-3322\"\u003eXTAR VC4SL — Charger Specs\u003c\/h2\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" data-sourcepos=\"45:1-58:155;3324-4782\"\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\"\u003eParameter\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\"\u003eValue\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\"\u003eInput\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eType-C, QC3.0 (9V⎓2A)\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\"\u003eCharging Current (CC)\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3A×1 \/ 2A×2 \/ 1A×4 \/ 0.5A×4 \/ 0.25A×4 — steps down automatically as more slots are occupied, or can be manually adjusted within what the slot count allows\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\"\u003eCharging Method\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3-stage charging (trickle → constant current → constant voltage), 4 independently monitored slots, dynamic power allocation based on input power available\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\"\u003eCut-off Voltage\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e4.2V ±0.05V (Li-ion) \/ 1.45V ±0.1V (Ni-MH\/Ni-Cd)\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\"\u003eCut-off Current\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e≤120mA\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\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e0°C to 40°C\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\"\u003eDimensions\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eL156mm x W115mm x H35mm\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\"\u003eNet Weight\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e212g\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\"\u003eDisplay\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eColor LCD — press Mode to cycle between capacity, current, and internal resistance readouts per slot in real time\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\"\u003eSpecial Modes\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCapacity\/grading mode (charge → discharge → recharge cycle to verify true capacity), storage mode (charges or discharges cells to their rated storage voltage to extend battery life), standard charge mode\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\"\u003eCompatible Cell Sizes\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e3.6V\/3.7V Li-ion: 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650, flat-top 32650. 1.2V Ni-MH\/Ni-Cd: AAA, AA, A, SC, C. Supports protected 20700\/21700 cells; spring-loaded slots can also fit two 32650s and two 18650s at once\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\"\u003eSafety\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eReverse polarity protection (displays \"Err,\" shows 0V, and stops automatically), auto cut-off when fully charged, multiple charge protections\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=\"60:1-60:294;4784-5077\"\u003e\u003cstrong\u003eA realistic note on charge time:\u003c\/strong\u003e the MJ1's own standard charge current is 1.675A, meaningfully above the VC4SL's 1A-per-slot rate with all four bays occupied — expect a full charge in roughly 4.5-5 hours for all four cells at once, a conservative and safe rate relative to the cell's spec.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"62:1-62:51;5079-5129\"\u003eWhy the Capacity Test Mode Matters for a 4-Pack\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"64:1-64:492;5131-5622\"\u003eThis is one of the clearest cases in our lineup for why grading mode earns its keep. Independent testing has already shown this cell can land meaningfully under its nominal rating depending on batch — buying four cells and being able to verify their actual measured capacity, rather than just trusting the 3,500mAh figure, tells you what you actually have before you build a pack around it. Cells with a wider gap during testing are worth flagging rather than mixing into a tight pack build.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"66:1-66:31;5624-5654\"\u003eWhere the MJ1 Actually Fits\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=\"68:1-71:133;5656-6079\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"68:1-68:84;5656-5739\"\u003e\n\u003cstrong\u003eHigh-capacity flashlights and headlamps\u003c\/strong\u003e running moderate-to-high output modes\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"69:1-69:78;5740-5817\"\u003e\n\u003cstrong\u003eE-bike and e-scooter packs\u003c\/strong\u003e where 10A per cell in parallel is sufficient\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"70:1-70:129;5818-5946\"\u003e\n\u003cstrong\u003e4S, 2S2P, or similar DIY pack configurations\u003c\/strong\u003e prioritizing energy density with more current headroom than pure energy cells\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"71:1-71:133;5947-6079\"\u003e\n\u003cstrong\u003eDIY power banks and backup builds\u003c\/strong\u003e wanting more runtime per cell than lower-capacity options, built from a verified matched set\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"73:1-73:204;6081-6284\"\u003eNot the right choice for sub-ohm\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"73:1-73:204;6081-6284\"\u003emechanical mods, or anything regularly demanding more than 10A per cell — for those, a dedicated high-drain cell like the Samsung 25R or 30Q is a better match.\u003c\/p\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"75:1-75:48;6286-6333\"\u003eThings Worth Knowing Before You Use This Kit\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=\"77:1-79:102;6335-6832\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"77:1-77:158;6335-6492\"\u003e\n\u003cstrong\u003eThis is an unprotected cell.\u003c\/strong\u003e The charger enforces its own voltage and current cutoffs, but your device still needs to handle discharge-side protection.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"78:1-78:238;6493-6730\"\u003e\n\u003cstrong\u003eDon't mix these cells with older ones you already own\u003c\/strong\u003e, even if they're also MJ1. Given the batch-to-batch capacity variability noted in independent testing, running the grading test before combining batches is genuinely worthwhile.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\" data-sourcepos=\"79:1-79:102;6731-6832\"\u003e\n\u003cstrong\u003e10A is a real ceiling.\u003c\/strong\u003e Don't use these in devices that regularly demand more current than that.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 class=\"text-text-100 mt-3 -mb-1 text-[1.125rem] font-bold\" data-sourcepos=\"81:1-81:30;6834-6863\"\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"83:1-84:256;6865-7186\"\u003e\u003cstrong\u003eCan this charger really tell me if a cell is underperforming?\u003c\/strong\u003e Yes — the grading\/capacity test mode charges, discharges, and recharges a cell while measuring the actual capacity delivered, rather than relying on the printed rating. Given the batch variability documented for this cell, that's a genuinely useful check.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"86:1-87:333;7188-7586\"\u003e\u003cstrong\u003eWhy might my actual measured capacity come in under 3,500mAh?\u003c\/strong\u003e Independent testing has shown some batch-to-batch variation with this cell, with measured capacity sometimes landing in the 3,200-3,400mAh range depending on discharge rate and batch. It's still a genuine high-capacity cell — just worth knowing that the nominal figure is a typical rating, not a guarantee for every individual unit.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"89:1-90:201;7588-7833\"\u003e\u003cstrong\u003eDoes Button Top affect fit in my device?\u003c\/strong\u003e It adds roughly 2mm to the cell's overall length compared to Flat Top. Most devices designed for Button Top 18650s account for this, but it's worth checking your battery compartment if space is tight.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"92:1-93:192;7835-8074\"\u003e\u003cstrong\u003eDo I need to charge all four cells at once?\u003c\/strong\u003e No — each of the four slots operates independently, so you can charge one, two, three, or four cells at a time, and mix different cell sizes or even NiMH batteries across the slots if needed.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"95:1-96:162;8076-8284\"\u003e\u003cstrong\u003eWhat happens if I insert a cell backwards?\u003c\/strong\u003e The display shows \"Err\" for that slot and the voltage reading drops to 0 — the charger stops working on that slot automatically rather than attempting to charge.\u003c\/p\u003e\n\u003chr class=\"border-border-200 border-t-0.5 my-3 mx-1.5\"\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" data-sourcepos=\"100:1-100:225;8291-8515\"\u003e\u003cstrong\u003eIn stock now.\u003c\/strong\u003e This bundle ships as a matched set of four genuine LG INR18650-MJ1 Button Top cells with a verified XTAR VC4SL charger — ready for high-capacity flashlights, e-bikes, and general electronics out of the box.\u003c\/p\u003e","brand":"LG","offers":[{"title":"Default Title","offer_id":51454218109174,"sku":"OAS1693","price":72.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/2753\/6886\/files\/lg-mj1-button-4pack-vc4sl-hero_a6d4d4bf-f30a-483c-b508-100b3fb56ae8.webp?v=1786968396","url":"https:\/\/oneandes.com\/products\/lg-inr18650-mj1-3500mah-10a-button-top-battery-4-pack-with-xtar-vc4sl-charger-high-capacity-long-run-power-kit-for-flashlights-power-stations-vapes","provider":"OneAndes","version":"1.0","type":"link"}