18650 Lithium Battery Capacity Tester Module – Digital mAh mWh Power Detector & Load Tester in Pakistan

Overview

Stop relying on cheap multimeters that only show voltage! The 18650 Battery Capacity Tester Module is a vital diagnostic tool designed to accurately assess the health of lithium-ion cells. By discharging the battery down to a safe, pre-set cutoff voltage, the board calculates the exact energy capacity in mAh (Milliamp-hours) and mWh (Milliwatt-hours). Whether you are salvaging laptop batteries or building custom 3S/4S battery packs for a Mini Router UPS, this tool ensures all your cells are perfectly balanced and authentic.

Key Features

• Dual Parameter Testing: Displays both cumulative discharge capacity (mAh) and discharge energy (mWh) simultaneously or via a toggle.

• Onboard Battery Holder: Features a built-in slot for the test battery, eliminating the need for messy wires or external 18650 holders.

• Dual Power Option: Can be powered via a Micro-USB/Type-C port or an external 5V-12V DC power supply.

• Adjustable Cut-off Voltage: Automatically stops discharging when the cell hits a safe threshold (default 3.0V, adjustable) to prevent over-discharge damage.

• Real-time Monitoring: Clear digital display shows current voltage, discharge current ($A$), and accumulated capacity in real time.

Technical Specifications

How it works in 3 Simple Steps

1. Power the Board: Plug a standard 5V supply into the USB input.

2. Insert Battery: Place a fully charged (4.2V) 18650 battery into the test slot.

3. Run the Test: Press the start button. The board will safely draw current until the battery reaches 3.0V, then flash your cell’s true mAh rating on the screen.