{"product_id":"ut3550-handheld-battery-tester","title":"UT3550 Handheld Battery Tester","description":"\u003cstyle\u003e\n.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;}\n.ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;}\n.ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;}\n.ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;}\n.ut-cat p{margin:.6em 0;}\n.ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;}\n.ut-cat img{max-width:100%;height:auto;}\n.ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;}\n.ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;}\n.ut-cat td strong{color:#222;}\n\u003c\/style\u003e\n\u003cdiv class=\"ut-cat\"\u003e\n\n\u003ch4\u003eOverview\u003c\/h4\u003e\n\u003cdiv class=\"product-container\"\u003e\n\u003cp\u003eThe UT3550 measures battery internal resistance and voltage together using a 4-wire Kelvin connection and 1 kHz AC injection — the method that reveals a weak cell before it fails under load. It resolves internal resistance from 0.001 mΩ to 30 Ω at ±0.5% and voltage to 100 V at ±0.05%, covering everything from small consumer cells to large industrial battery banks.\u003c\/p\u003e\n\u003cp\u003eA 4-wire connection removes lead resistance for accuracy at low ohms, a comparison function sorts pass\/fail against set limits, and results log to 500 groups with CSV export over USB-C. The IP65 body and rechargeable pack suit field and maintenance work. It's backed by UNI-T's nearly 40 years of test-meter manufacturing.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAC-injection internal-resistance method (1 kHz)\u003c\/li\u003e\n\u003cli\u003eInternal resistance 0.001 mΩ to 30 Ω, ±0.5%\u003c\/li\u003e\n\u003cli\u003eVoltage 0.0001 V to 100 V, ±0.05%\u003c\/li\u003e\n\u003cli\u003e4-wire Kelvin connection removes lead resistance\u003c\/li\u003e\n\u003cli\u003eComparison function with pass\/fail sorting\u003c\/li\u003e\n\u003cli\u003eData logging to 500 groups; CSV export over USB-C\u003c\/li\u003e\n\u003cli\u003eDual display (LCD \u0026amp; OLED); IP65 sealing\u003c\/li\u003e\n\u003cli\u003eRechargeable 7.4 V 2000 mAh Li-ion\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eUT3550 Details\u003c\/h2\u003e\n\u003ch3\u003eInternal Resistance \u0026amp; Voltage Together\u003c\/h3\u003e\n\u003cp\u003eInternal resistance rises as a cell ages, often well before its open-circuit voltage drops. By measuring resistance (0.001 mΩ–30 Ω) and voltage (to 100 V) at the same time, the UT3550 flags a weakening cell while it still reads a normal voltage.\u003c\/p\u003e\n\u003ch3\u003e4-Wire Kelvin Accuracy\u003c\/h3\u003e\n\u003cp\u003eA 4-wire Kelvin connection separates the current and sense paths so lead and contact resistance don't corrupt the reading — essential for the milliohm-level measurements that distinguish a healthy cell from a tiring one.\u003c\/p\u003e\n\u003ch3\u003eSorting \u0026amp; Logging\u003c\/h3\u003e\n\u003cp\u003eA comparison function sorts cells pass\/fail against set limits for fast battery-bank screening, and logging to 500 groups with CSV export over USB-C builds the record a maintenance program needs.\u003c\/p\u003e\n\u003ch3\u003eField Build\u003c\/h3\u003e\n\u003cp\u003eA dual LCD\/OLED display, IP65 sealing, and a rechargeable Li-ion pack make the UT3550 practical for moving down a rack of cells in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cp\u003eUPS, telecom, and stationary battery-bank maintenance; testing consumer and industrial cells from small to large; incoming inspection and pass\/fail sorting; and preventive programs that track internal resistance over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"product-container\"\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eWhy measure internal resistance instead of just voltage?\u003c\/h3\u003e\n\u003cp\u003eInternal resistance rises as a battery ages, often before voltage drops — so it catches a weak cell earlier.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eWhat is the 4-wire Kelvin method?\u003c\/h3\u003e\n\u003cp\u003eIt uses separate current and sense leads so lead and contact resistance don't affect the milliohm-level reading.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq-item\"\u003e\n\u003ch3\u003eCan I export results?\u003c\/h3\u003e\n\u003cp\u003eYes — log to 500 groups and export CSV over USB-C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDC Voltage In\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100 V (0.0001 V to 100.00 V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Resistance Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.001 mΩ to 30.00 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 Ω (0.001 mΩ to 30.00 Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.0001 V to 100.00 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Test Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 kHz±30 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.1 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.001 mΩ \/ 0.1 mV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eResistance: ±0.5%rdg±5dgt , Voltage: ±0.05%rdg±5dgt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAuto Ranging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTest Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-Wire Kelvin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eComparison Function\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eData Logging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProgrammable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFastest Test Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\/s manual range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDual Display\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUSB-Type-C, USB-Device\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eData Storage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e500 groups internal, CSV export\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIP Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIP65\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.5in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual Display LCD \u0026amp; OLED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.4 V 2000 mAh Li-ion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 5h (20% brightness)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 5 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 °C to 40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 to 80%RH\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20 °C to 60 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Test Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC Injection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch4\u003eDocumentation\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/storage.googleapis.com\/uni-tdocuments\/Meter%20Datasheets\/UT3550%20Series%20Battery%20Testers%20-%20Data%20Sheet.pdf\"\u003eUT3550 Datasheet\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"https:\/\/storage.googleapis.com\/uni-tdocuments\/Meter%20User%20Manuals\/UT3550_User_Manual.pdf\"\u003eUT3550 User Manual\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"Uni-Trend US","offers":[{"title":"Default Title","offer_id":46595297149089,"sku":"182700400010X","price":1679.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/5649\/2449\/files\/UT3550_1.jpg?v=1782259620","url":"https:\/\/aaashopus.com\/products\/ut3550-handheld-battery-tester","provider":"SHOPSHOPSHOP","version":"1.0","type":"link"}