Measure Battery Health like a Pro — Arduino Uno Battery Load Tester with INA219 & OLED

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

Turn any 9V battery into a science experiment. This kit walks you through building a real constant current load tester — the same tool engineers use to quantify battery quality. Your Arduino Uno drives a MOSFET to pull exactly 1A, while the INA219 sensor logs voltage and current 100 times a second. The OLED instantly displays the calculated internal resistance, giving you a clear picture of battery ageing and state-of-charge — a perfect entry into electronics measurement for school projects or hobby investigation.

What You'll Build

In under four hours, you’ll assemble a standalone battery tester on a breadboard. The device applies a steady 1A load and tracks how voltage drops. From that, you’ll compute the battery’s internal resistance — a single number that reveals if a battery is fresh, worn out, or counterfeit. It’s the ideal hands-on project for a CBSE physics investigatory project, an ATL innovation lab challenge, or a weekend exploration of Python scripting with real hardware.

What You'll Learn

• Program a closed-loop constant current sink using Arduino and a MOSFET
• Read voltage and current data from the INA219 over I2C
• Calculate internal resistance with Ohm’s law and voltage drop analysis
• Display real-time measurements on a 128×64 OLED screen

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Designed for young makers and students from age 10 upward. If you’re tackling a CBSE Class 11/12 physics project, assembling an ATL innovation prototype, or simply want to understand the hidden health of batteries with real data, this kit gives you everything pre-sorted. It’s also a popular first instrumentation project for B.Tech ECE/EEE candidates at IIT, NIT, VIT, and BITS campuses.

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.