Battery State of Health Estimator Kit with Arduino Uno + LED
Battery State of Health Estimator Kit — Measure Capacity Fade & Estimate SoH with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
You’ll assemble a complete battery analyzer that runs a controlled charge-discharge cycle, captures precise current and voltage data, and computes State of Health as a percentage of nominal capacity. The onboard microSD logs every test to track degradation over weeks or months — an indispensable tool for anyone grading used cells or validating battery packs for drones, EVs, or backup systems.
What You'll Build
A portable Arduino-powered instrument that automatically discharges a single-cell lithium battery through a fixed load, measures accumulated milliamp-hours, and compares them to the battery’s rated capacity. The OLED displays real-time voltage, current, elapsed mAh, and the final SoH percent. All cycle data is time-stamped by the RTC and saved as CSV for spreadsheet analysis.
What You'll Learn
- Designing precision current and voltage measurement circuits with INA219 sensor modules and I2C multiplexing
- Implementing charge-discharge control using MOSFET switching and TP4056 charging
- Logging time-stamped data to a microSD card and displaying real-time metrics on an OLED
- Calculating battery State of Health from capacity fade using Arduino-based algorithms
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| INA219 | 2 |
| TCA9548A I2C Mux | 1 |
| IRF540N MOSFET | 1 |
| TP4056 Module | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| 10Ω 5W Resistor | 1 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
CBSE Class 11-12 students exploring applied physics and energy storage, B.Tech ECE/EEE undergraduates prototyping battery management systems, ATL Tinkering Lab mentors needing a ready-made module for capacity experiments, and EV hobbyists in Bengaluru, Delhi, or Hyderabad who want to grade reused 18650 cells.
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.
What if I get stuck during the build?
Use the AI companion for instant troubleshooting, or drop a WhatsApp message with a photo of your setup; we’ll guide you within hours.
Can this kit test both Lithium-ion and Lithium-polymer batteries?
Yes, the charge-discharge circuit works with single-cell Li-ion/Li-Po (3.7 V nominal) up to 4.2 V, including 18650, 14500, and pouch cells.
Does the kit measure SoH for batteries with different nominal capacities?
The Arduino sketch lets you input the battery’s rated mAh; the SoH is displayed as a percentage of that value, accurate for capacities from 500 mAh to 3000 mAh with the included 10 Ω load.
What logging resolution does the microSD provide?
The DS3231 RTC timestamps data every second during discharge, storing voltage, current, mAh, and instantaneous SoH to a CSV file for analysis in Excel or Python.
Full charge-discharge cycle with INA219 measures capacity fade. Compares against nominal to estimate SoH percent.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items