Arduino Mega 4-Cell Battery Balancer Kit - Maximise 18650 Cycle Life

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

Take control of distributed energy storage by building your own microcontroller-based battery management system. This kit lets you construct a 4-cell 18650 balancer that actively manages charging and discharging to double the lifespan of lithium-ion packs-critical for solar backup, portable power stations, and EV sub-modules.

What You'll Build

You'll assemble a DIN-rail-mounted controller that monitors individual cell voltages via INA219 sensors, switches balancing relays with an Arduino Mega, and logs data to an SD card with timestamps. The final system implements a charge dispatch algorithm that prioritises weaker cells, preventing overcharging and extending overall pack cycle life well beyond a passive BMS.

What You'll Learn

• Design and calibrate a multi-channel I�C current/voltage sensing network using the TCA9548A multiplexer and INA219 modules.
• Program relay-based charge balancing logic on the Arduino Mega, including per-cell cut-off thresholds and idle state management.
• Develop a charge dispatch algorithm that rotates load based on real-time cell health data from RTC-tagged sensor logs.
• Integrate an OLED display and SD card datalogger to visualise state-of-charge and track performance over weeks of operation.

Kit Contents

Four 18650 cells managed individually. Balancing relays and charge dispatch algorithm maximise cycle life.

What's in this kit

• Arduino Mega 2560
• INA219 x4
• TCA9548A I2C Mux
• 5V Relay Module x8
• TP4056 Module x4
• 18650 Cell x4
• DS3231 RTC
• MicroSD Module
• 0.96in OLED
• 100nF Caps x15
• PCB Prototype Board x3
• DIN Rail Enclosure
• 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.