{"product_id":"2-channel-18650-21700-battery-capacity-tester-with-internal-resistance-meter-1a-charge-discharge","title":"2-Channel 18650 21700 Battery Capacity Tester with Internal Resistance Meter, 1A Charge\/Discharge","description":"\u003ch2\u003e2-Channel 18650 \/ 21700 Battery Capacity Tester with Internal Resistance Meter\u003c\/h2\u003e\n\n\u003cp\u003eThis compact \u003cstrong\u003e2-channel battery tester\u003c\/strong\u003e is designed for testing \u003cstrong\u003e18650 and 21700 lithium-ion cells\u003c\/strong\u003e. It supports \u003cstrong\u003ecapacity testing, internal resistance measurement, charging, discharging, and automatic cycle testing\u003c\/strong\u003e, making it a useful tool for DIY battery builders, hobbyists, and anyone sorting or checking individual cells.\u003c\/p\u003e\n\n\u003cp\u003eThe tester includes \u003cstrong\u003ebuilt-in 18650 holders\u003c\/strong\u003e as part of the main unit. For testing \u003cstrong\u003e21700 cells\u003c\/strong\u003e, an \u003cstrong\u003eexternal 21700 holder is required\u003c\/strong\u003e. That external holder is a \u003cstrong\u003eseparate option and is not included\u003c\/strong\u003e unless specifically selected.\u003c\/p\u003e\n\n\u003cp\u003eEach channel works \u003cstrong\u003eindependently\u003c\/strong\u003e, allowing you to test two cells at the same time with separate settings and operation. The unit also includes \u003cstrong\u003efan cooling\u003c\/strong\u003e for improved heat dissipation during discharge testing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 independent test channels\u003c\/li\u003e\n  \u003cli\u003eBuilt-in holders for 18650 cells\u003c\/li\u003e\n  \u003cli\u003eSupports 21700 cells with optional external holder\u003c\/li\u003e\n  \u003cli\u003eMeasures battery capacity and approximate internal resistance\u003c\/li\u003e\n  \u003cli\u003eSupports charging and discharging functions\u003c\/li\u003e\n  \u003cli\u003eAutomatic mode supports up to 9 charge\/discharge cycles\u003c\/li\u003e\n  \u003cli\u003eAdjustable discharge cutoff voltage from 2.5V to 3.5V\u003c\/li\u003e\n  \u003cli\u003eType-C power input\u003c\/li\u003e\n  \u003cli\u003eActive fan cooling\u003c\/li\u003e\n  \u003cli\u003eEnglish and Chinese system language\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Voltage:\u003c\/strong\u003e DC 5V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Supply Interface:\u003c\/strong\u003e Type-C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupported Batteries:\u003c\/strong\u003e Lithium-ion batteries with stop discharge voltage from 2.5V to 3.5V, start voltage from 2.8V, and full charge voltage up to 4.2V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSupported Cell Sizes:\u003c\/strong\u003e 18650, 21700\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-In Battery Holders:\u003c\/strong\u003e 18650 only\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21700 Compatibility:\u003c\/strong\u003e Requires optional external 21700 holder, not included unless selected\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTest Channels:\u003c\/strong\u003e 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Resistance Measurement:\u003c\/strong\u003e Yes, DC two-wire method\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging Function:\u003c\/strong\u003e Supported\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging Current:\u003c\/strong\u003e Up to approximately 1A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Full Voltage:\u003c\/strong\u003e 4.2V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Termination:\u003c\/strong\u003e Below 0.1A current\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDischarge Function:\u003c\/strong\u003e Supported\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDischarge Current:\u003c\/strong\u003e Up to approximately 1A, non-constant, non-adjustable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic Charge\/Discharge:\u003c\/strong\u003e Supported\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCycle Count:\u003c\/strong\u003e Adjustable from 1 to 9 cycles in automatic mode\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStatus Alert:\u003c\/strong\u003e Supported\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCooling:\u003c\/strong\u003e Fan active heat dissipation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverheating Protection:\u003c\/strong\u003e Supported\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Stop Discharge Voltage:\u003c\/strong\u003e 2.5V to 3.5V in 0.1V steps\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Failure Save:\u003c\/strong\u003e Saves setup parameters only, does not save measurement data\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Size:\u003c\/strong\u003e 190 × 50 × 27 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eNot suitable for LiFePO4 charging\u003c\/li\u003e\n  \u003cli\u003eInternal resistance measurement uses a DC two-wire method, so values are for reference only\u003c\/li\u003e\n  \u003cli\u003eDischarge current is not adjustable\u003c\/li\u003e\n  \u003cli\u003eIf no battery is installed, the internal resistance may display 9999 mΩ\u003c\/li\u003e\n  \u003cli\u003eCapacity results should be judged from the discharge portion of the test\u003c\/li\u003e\n  \u003cli\u003eDischarge components may become hot during testing\u003c\/li\u003e\n  \u003cli\u003e21700 testing requires the optional external holder if your package does not include it\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2-Channel Battery Capacity and Internal Resistance Tester ×1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This unit includes \u003cstrong\u003ebuilt-in 18650 holders\u003c\/strong\u003e. The \u003cstrong\u003eexternal 21700 holder is a separate option\u003c\/strong\u003e and is \u003cstrong\u003enot included\u003c\/strong\u003e unless specifically selected with that package version.\u003c\/p\u003e","brand":"DIY500AMP","offers":[{"title":"Default Title","offer_id":42697359032391,"sku":"9030","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/8055\/7127\/files\/dual-channel-18650-battery-capacity-tester-pcb-view.jpg?v=1776076415","url":"https:\/\/diy500amp.com\/products\/2-channel-18650-21700-battery-capacity-tester-with-internal-resistance-meter-1a-charge-discharge","provider":"DIY500AMP.COM","version":"1.0","type":"link"}