{"product_id":"yr1035-battery-internal-resistance-tester-true-4-wire-18650-21700-lifepo4","title":"YR1035+ Battery Internal Resistance Tester – True 4-Wire, 18650\/21700\/LiFePO4","description":"\u003ch3\u003eYR1035+ Battery Internal Resistance Tester – True 4-Wire\u003c\/h3\u003e\n\u003cp\u003eThe tester we use on our own bench to grade and match cells before every rebuild. Internal resistance (IR) tells you far more about a cell's health than voltage alone: high-IR cells heat up, sag under load, and drag down the whole pack. Measure IR and voltage at the same time, then group cells with matching readings for a balanced, long-lasting pack.\u003c\/p\u003e\n\u003ch4\u003eWhy rebuilders use it\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue 4-wire (Kelvin) measurement\u003c\/strong\u003e – lead resistance doesn't skew the reading\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIR and voltage on one screen\u003c\/strong\u003e – grade cells in seconds\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eWorks with 18650, 21700, LiFePO4, and large prismatic cells\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eUSB rechargeable\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eInternal resistance range: 0.00001Ω – 200Ω\u003c\/li\u003e\n\u003cli\u003eVoltage range: 0.00001V – 100V\u003c\/li\u003e\n\u003cli\u003eOperating temperature: 10°C – 40°C\u003c\/li\u003e\n\u003cli\u003eIncludes Kelvin clip leads and probe leads\u003c\/li\u003e\n\u003cli\u003ePackaged weight: approx. 1.0kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eTip: For cell matching, measure all cells at the same temperature and state of charge, then group cells within a few milliohms of each other.\u003c\/em\u003e\u003c\/p\u003e","brand":"RenewSpark","offers":[{"title":"Default Title","offer_id":67610351173859,"sku":"TL102","price":74.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/7594\/8771\/files\/FullSizeRender_ac4604b1-a414-4f1a-b38b-64f7c9da53c3.jpg?v=1791035580","url":"https:\/\/renewspark.com\/products\/yr1035-battery-internal-resistance-tester-true-4-wire-18650-21700-lifepo4","provider":"RenewSpark","version":"1.0","type":"link"}