Battery Capacity Discharge Tester Kit with Arduino Uno
Build Your Own Arduino Battery Capacity Tester – Discharge, Measure & Analyse mAh
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 build a fully functional battery discharge tester that characterises any Li-ion or NiMH cell with lab-grade accuracy. Set a programmable C-rate via MCP4725 DAC and MOSFET, let the load sink current while the INA219 measures mAh and voltage, and watch the live discharge curve plot on the TFT. Every data point logs to microSD for later analysis — a complete tool for serious makers and students.
What You'll Build
By the end of this build, you’ll have a compact, Arduino-powered instrument that can test battery capacity just like a commercial unit. You’ll configure a discharge current based on the battery’s C-rating, and the system precisely logs voltage, current, and time-stamped mAh until a safe cut-off voltage. The real-time TFT graph reveals the true health of your cells, while the microSD module stores full discharge reports you can analyse with any spreadsheet.
What You'll Learn
- Design a constant-current load with MOSFET and DAC feedback
- High-side current and voltage sensing using INA219 over I2C
- Timestamp data logging with DS3231 RTC and SD card module
- Plot live discharge curves on a 1.8-inch TFT display
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| INA219 | 1 |
| IRF540N MOSFET | 1 |
| 1Ω 5W Resistor | 2 |
| MCP4725 DAC | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 1.8in TFT ST7735 | 1 |
| 100Ω Gate Resistors | 3 |
| 100nF Caps | 5 |
| 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
This kit is ideal for CBSE Class 11-12 students exploring physics and electronics, B.Tech ECE/EEE undergraduates building a battery management project, or hobbyists at ATL Tinkering Labs and IIT/NIT/VIT/BITS maker spaces. If you’ve ever wasted time testing batteries with a multimeter and a resistor, this kit gives you a professional tool you made yourself, complete with datalogging and visual discharge curves.
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?
Our AI companion provides instant troubleshooting steps; you can also reach us via WhatsApp for personalized help.
Can I test batteries of different chemistries?
Yes. Configure the cut-off voltage and discharge current for Li-ion, LiPo, NiMH, or lead-acid cells directly in the code.
How do I load the code onto the Arduino?
We supply a ready-to-upload sketch with detailed comments; just open it in the Arduino IDE and install the required libraries.
Is soldering experience required?
Basic soldering skills are needed. The kit includes an iron and wire, and our build guide shows every connection on the prototype board.
Discharge at programmable C-rate via MOSFET load. INA219 integrates mAh. TFT shows discharge curve.
What's in this kit
- Arduino Uno R3
- INA219
- IRF540N MOSFET
- 1Ω 5W Resistor x2
- MCP4725 DAC
- DS3231 RTC
- MicroSD Module
- 1.8in TFT ST7735
- 100Ω Gate Resistors x3
- 100nF Caps x5
- PCB Prototype Board x2
- Soldering Iron
- Solder Wire
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.
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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