{"product_id":"2-channel-18650-battery-capacity-tester-mah-mwh-internal-resistance-meter","title":"2-Channel 18650 Battery Capacity Tester | mAh mWh Internal Resistance","description":"\n\u003ch2\u003eHELTC 2-Channel 18650 Battery Capacity Tester with Internal Resistance Measurement\u003c\/h2\u003e\n\u003cp\u003eTake the guesswork out of battery health with the \u003cstrong\u003eHELTC 2-Channel Digital Battery Capacity Tester\u003c\/strong\u003e. Designed for hobbyists, makers, and electronics enthusiasts, this compact dual-channel tester accurately measures \u003cstrong\u003emAh, mWh, and internal resistance\u003c\/strong\u003e for 18650 and compatible lithium-ion cells — all from a single, easy-to-use device powered via USB Type-C.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual-Channel Testing:\u003c\/strong\u003e Test two batteries simultaneously for faster throughput and direct comparison.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Resistance Measurement:\u003c\/strong\u003e Uses the DC two-wire method to accurately measure a battery's internal resistance — a key indicator of cell health and performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1A Charge \u0026amp; Discharge:\u003c\/strong\u003e Supports up to ~1A charging (auto cut-off at 4.2V, stops when current drops below 0.1A) and ~1A discharge with 11 adjustable stop-discharge voltage steps (2.5V–3.5V).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic \u0026amp; Cyclic Modes:\u003c\/strong\u003e Run automated charge-then-discharge sequences or set up to 9 charge\/discharge cycles (in automatic mode) for thorough capacity evaluation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFan Active Cooling \u0026amp; Overheat Protection:\u003c\/strong\u003e A built-in fan actively dissipates heat during operation, and automatic overheating protection keeps testing safe and reliable.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Alerts:\u003c\/strong\u003e On-screen alerts notify you of key events during the testing process.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnglish Language Interface:\u003c\/strong\u003e Clear, easy-to-read English menus for intuitive operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType-C Power Interface:\u003c\/strong\u003e Powered at DC 5V via the included Type-C power supply and cable — no proprietary connectors.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Durable:\u003c\/strong\u003e Plastic and metal construction at just 190 × 50 × 27 mm — fits neatly on any workbench.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5V (via Type-C)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Batteries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLithium-ion cells with discharge stop voltage 2.5V–3.5V, start voltage 2.8V, full charge 4.2V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 independent channels\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to ~1A; auto cut-off at 4.2V full charge\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDischarge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to ~1A (non-adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStop Discharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.5V – 3.5V, 11 adjustable steps\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCyclic Testing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1–9 cycles (automatic mode only)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCooling\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive fan cooling\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverheat Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e190 × 50 × 27 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× 2-Channel Battery Capacity \u0026amp; Internal Resistance Tester\u003c\/li\u003e\n  \u003cli\u003eType-C power supply and cable (included)\u003c\/li\u003e\n  \u003cli\u003e\u003cem\u003eNote: Batteries are NOT included.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This device does \u003cstrong\u003enot\u003c\/strong\u003e support lithium iron phosphate (LiFePO4) battery charging. Discharge current is non-adjustable. Power failure saves setup parameters only — measurement data is not retained after a power loss. Slight color variation from product images may occur due to monitor settings and lighting conditions.\u003c\/p\u003e\n\n\u003ch3\u003eExplore More Electronics \u0026amp; Tools\u003c\/h3\u003e\n\u003cp\u003eLooking for more electronics essentials? Check out our related products:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-art-print\"\u003e\"1% Better Every Day\" Motivational Canvas Wall Art Print\u003c\/a\u003e — a great addition to any maker's workspace.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/best-seat-in-the-house-retro-quote-canvas-wall-art-print\"\u003e\"Best Seat In The House\" Retro Quote Canvas Wall Art Print\u003c\/a\u003e — perfect for your workshop or hobby room.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe battery handling and electronics best practices, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of batteries are compatible with this 18650 battery capacity tester?\u003c\/h4\u003e\n\u003cp\u003eA: This tester is compatible with lithium-ion batteries that have a discharge stop voltage between 2.5V and 3.5V, a start voltage of 2.8V, and a full charge voltage of 4.2V. This includes standard 18650 Li-ion cells. It does \u003cstrong\u003enot\u003c\/strong\u003e support lithium iron phosphate (LiFePO4) battery charging.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I test two batteries at the same time?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The tester features two independent channels, allowing you to measure the mAh, mWh capacity, and internal resistance of two batteries simultaneously — saving you time when evaluating a batch of cells.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does internal resistance measurement tell me about a battery?\u003c\/h4\u003e\n\u003cp\u003eA: Internal resistance is a key indicator of a battery cell's health and age. A lower internal resistance generally means a healthier, higher-performing cell, while a higher reading suggests wear or degradation. This tester uses the DC two-wire method for accurate internal resistance readings.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How many charge\/discharge cycles can I program?\u003c\/h4\u003e\n\u003cp\u003eA: In automatic mode, you can set between 1 and 9 consecutive charge\/discharge cycles. This is useful for conditioning new cells or thoroughly evaluating capacity over multiple cycles.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What power supply does this tester require?\u003c\/h4\u003e\n\u003cp\u003eA: The tester operates at DC 5V and connects via a standard USB Type-C interface. A compatible power supply and cable are included in the package.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of batteries are compatible with this 18650 battery capacity tester?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This tester is compatible with lithium-ion batteries that have a discharge stop voltage between 2.5V and 3.5V, a start voltage of 2.8V, and a full charge voltage of 4.2V. This includes standard 18650 Li-ion cells. It does not support lithium iron phosphate (LiFePO4) battery charging.\"}}, {\"@type\": \"Question\", \"name\": \"Can I test two batteries at the same time?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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