18650 Cell Capacity Tester Kit with Arduino Uno – Measure True mAh of Any 18650 Cell

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

Uncover the real capacity of your 18650 lithium-ion cells—not the label rating. This kit gives you a dedicated constant-current discharge tester with an LCD readout, so you can bin cells, match capacities, and build safe, reliable battery packs. Perfect for makers, students, and anyone who salvages cells from old laptops or power banks.

What You'll Build

A standalone 18650 cell capacity meter that displays voltage, current, and accumulated mAh on a crisp 16x2 LCD. The circuit uses a MOSFET as a voltage-controlled load and an ACS712 Hall-effect sensor to precisely track current, eliminating guesswork. You’ll have a benchtop tool you can reuse for every battery project.

What You'll Learn

• Constant-current discharge using an N-channel MOSFET
• Current sensing with ACS712 5A module and noise filtering
• Voltage measurement with Arduino analog dividers
• Calculating capacity (mAh) by integrating discharge current over time

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

CBSE Class 11‑12 physics students exploring practical electronics, B.Tech ECE/EEE freshmen undertaking mini‑projects, ATL Tinkering Lab facilitators running energy measurement workshops, and hobbyists salvaging 18650 cells from old laptop batteries. If you’ve ever wondered whether your cells deliver the promised 2500 mAh, this kit is for you.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.