Features: The 99 Gears 12V spots Welder delivers precise control with 99 adjustable power levels and a current of 1500A, featuring 5 high efficiency transistors for reliabled nickel sheet welding on 18650 lithium batteries in energy storage systems. Equipped with real time voltages monitoring (8-17V ranging), temperature protective up to 45℃, and 10AWG aluminum welding pens, this portable soldering equipment ensures safe, high current operations for diyer battery assembly. Designed for electronics enthusiasts, seeking a compact, adjustable spots welding solution for crafting or repairing 18650 based energy storage devices. Ideal for securely bonding nickel sheets to lithium batteries workshops, electronics labs, or small scale manufacturing setups requiring precise, repeatable welds with minimal standby power consumption (<0.5mA). Its step by step current limiting guidance and double display modes (gear/temperature/voltages) simplify complex welding tasks while maintaining compatibility with 12V batteries, and automotive starter power sources. Specifications: Component:Metal Size: Approx. 5.5x9cm/2.16x3.54inch Product model: a99 Working voltages: 12v Working current: 100-300a Standby power consumption: <0.5ma Welded nickel plate thickness: 0.1-0.3mm (related to battery rate) Package Includes: 1pcs spots Welding Control Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.