For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
The FNIRSI HRM-10 Tester Clamp is a professional-grade Kelvin clip designed to measure internal resistance on cylindrical lithium-ion cells like 18650 and 26650. With its round clamp design and 4-wire configuration, it provides stable and precise contact, reducing lead resistance for more accurate readings.
Key Features:
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✅ Authentic FNIRSI accessory for IR testing
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✅ Kelvin four-wire clamp – ideal for use with internal resistance meters
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✅ Compatible with round lithium cells: 18650, 26650, 21700, and similar
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✅ Spring-loaded jaws ensure strong grip and consistent connection
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✅ Low resistance path for accurate, repeatable measurements
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✅ Durable ABS housing with firm handheld grip
Technical Specs:
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Brand: FNIRSI
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Model: HRM-10
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Type: Battery Clamp (Kelvin style)
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Application: Internal Resistance and Voltage Drop Testing
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Supported Cell Types: 18650 / 26650 / 21700 / Round Cells
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Material: ABS + Copper Alloy Contacts
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Connection: 4-Wire Clamp (Kelvin Measurement)
This clamp is a must-have tool for DIY battery pack builders, testers, and professionals who rely on precision measurements to sort cells or ensure quality control.
DIY500AMP.COM Product – Precision Tools for Real Builders
⚡ Ships from the USA – Limited stock available
💡 Ideal companion for IR meters and professional cell testers
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
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Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
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