It displays real-time battery voltage, discharged capacity and discharge current. It can test battery capacity that helps select batteries with the desired capacity. It saves time when users wish to store their large capacity batteries. It helps activate the best performance of your batteries for competition.The BD250 is a powerful discharging device that allows the user to discharge a battery at up to 35 amps or 250 watts and also measures and compares the performance of batteries. BD250 allows for the precise measurement of battery capacity and takes the guesswork out of choosing the best battery for your application.SIMPLE, ROBUST & POWERFULUpgraded from BD200, BD250 is not only a powerful discharging device but also a precise measurement tool for battery capacity. It takes the guesswork out of choosing the good-performance battery for your application. BD250 offers a maximum of 250 Watts/35 Amps to discharge your battery and will test virtually any battery type or size, any chemistry cells. It’s stylish but small with a high-performance cooling system and uses MOSFETS from the well-known IXYS, to make sure it can discharge at 250 watts continuously.Breakthrough Cooling SystemA unibody and larger fan pushes air downward through an extruded aluminum heat sink. As air passes vertically through the heat sink, it absorbs heat and carries it out. Due to cooling efficiency, BD250 can discharge at 250 Watts continuously.Specs:   – Dimension: 136.6 x 104.8 x 107mm   – Weight: 879g   – Accepted Voltage Range: 5.40-35.00V   – Low Voltage Alert: <5.2V   - High Voltage Alert: >35V Max.   – Discharge Power: 250W   – Discharge Current Range: 0.01A-35.00A   – Discharge Power: 250W   – Current Consumption in Sleep Mode: <100uA   - Capacity Display Accuracy: ±3%Current Display Accuracy:   - 0.01-10.00A ±60mA   - 10.00-35.00A ±3%Voltage Display Accuracy:   - 5.4-10V <80mV   - 10-20V <120mV   - 20-35V <160mV