Arduino Mega 4-Cell Battery Balancer Kit - Maximise 18650 Cycle Life — an advanced-level kit for adults.

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 1-5 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 I²C 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

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.