150W 10A DIY Battery Capacity Tester – Constant Current Load Kit
150W 10A DIY Battery Capacity Tester – Constant Current Load Kit
150W 10A DIY Battery Capacity Tester Kit – Adjustable Constant Current Electronic Load Discharge Test
Take full control of your electronics bench with this 150W 10A DIY Battery Capacity Tester Kit. Designed for hobbyists, engineers, and electronics enthusiasts, this semi-finished DIY kit lets you build a powerful adjustable constant-current electronic load for testing battery capacity, verifying power supply output, and running product burn-in/aging tests.
Key Features
- Adjustable Constant Current: Set the discharge current to your desired value; the circuit maintains a stable constant current throughout the test.
- High Power Rating: Handles up to 150W and 10A, suitable for a wide range of battery and power supply tests.
- Wide Voltage Range (up to 300V board voltage): Test various DC power sources without worrying about range limitations.
- Scalable Design: Connect multiple boards in parallel to increase total power dissipation capacity.
- TL431 Reference + LM324 Op-Amp Circuit: Classic, proven constant-current circuit topology using TL431 reference voltage, sense resistor, and LM324 op-amp error amplification paired with 4× MOS transistors on a CPU-style heat sink.
- Compatible MOS Tube Options: Supports 80NF70, IRF3205, HRF3250, IRF1010, IRF2807, IRF1405, 047an08ao, and high-power TO-247 packages like IRF250/IRF260.
- Integrated Cooling Fan Terminal (FAN): Dedicated connector for an active cooling fan to keep the MOSFETs within safe operating temperatures.
- Digital Dual Display Meter Ready: Built-in wiring provisions for a dual-display volt/amp meter head (not included); clean color-coded wire connections for V+, GND, current sense, and voltage sense.
- PC + Metal Construction: Durable mixed-material build for long-lasting workshop use.
Package Contents
- 2 × Battery Capacity Tester DIY Kits
Battery, heat sink, digital meter, fan, and power supply are NOT included. Other products shown in images are for illustration purposes only.
Important Assembly Notes
- Apply thermal grease to each power tube before mounting directly to the heat sink. Always attach the heat sink before powering on — failure to do so may burn out the power transistors.
- The heat sink must NOT be connected to the negative rail of the 12V DC jack; do not bridge the heat sink to any metal enclosure simultaneously.
- When wiring the dual display meter, connect only the small red wire (left end of board) to the meter's +12V supply. Do NOT connect the thin black wire to GND — this will introduce current measurement inaccuracies.
- Wire connections: A+– thick red/black → current measurement; V+ → thin yellow wire (voltage sense); IN = test input; red/black test terminals → device under test; FAN terminal → cooling fan.
- For 12V switching power supply operation, solder wires to the +– pads on the right side of the board, or add a DC barrel jack and bridge the +– pads with short wires. The 4 rectifier diodes can be soldered in place.
- Open the knob cap and tighten the setscrew after adjusting the current.
Specifications
| Max Power | 150W |
| Max Current | 10A (adjustable) |
| Max Board Voltage | 300V DC |
| Power Source | DC |
| Circuit Topology | TL431 + LM324 + 4× NMOS constant-current |
| Material | PC + Metal |
| Kit Type | Semi-finished DIY Kit (assembly required) |
| Quantity | 2 kits per package |
| Country of Origin | Made in Mainland China |
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Learn more: ENERGY STAR product efficiency guidance
Frequently Asked Questions
Q: What is a constant-current electronic load tester used for?
A: A constant-current electronic load tester draws a fixed, adjustable current from a power source under test. This lets you verify the true output current capacity of a battery or power supply, measure actual battery capacity (mAh/Ah) under real load conditions, and perform product burn-in/aging tests — all without relying on an external variable resistor.
Q: Do I need soldering skills to assemble this DIY kit?
A: Yes. This is a semi-finished DIY kit — the PCB is partially assembled, but through-hole soldering of components such as the MOS power tubes, rectifier diodes, DC jack, and wire connections is required. Basic soldering experience and appropriate tools (soldering iron, thermal grease, heat sink) are recommended for successful assembly.
Q: Can I increase the power handling beyond 150W?
A: Yes. The board is designed to be paralleled with additional identical boards. Connecting multiple boards in parallel distributes the load and increases the total power dissipation capacity proportionally, making it easy to scale up for higher-wattage testing requirements.
Q: What power supply do I need to run this tester?
A: The board's control circuitry operates from a 12V DC switching power supply. The load input terminals (IN / test input) accept the DC source being tested, which can range up to the board's 300V maximum voltage rating. Ensure the heat sink is securely mounted before applying any power.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.