Lithium Battery Anode: Aluminum tab+ Aluminum Foil (Rectangle Welding) SP-M-700 (800) 1) Max. Input Power: 700VA-800VA 2) Frequency: 35KHz-40KHz 3) Welding Technology: A, Aluminum Tab 0.10mm+Aluminum Foil 0.018mm Rectangle welding (Length is 30mm) B, Aluminum Tab 0.10mm+Aluminum Foil 0.018mm Four Multipoint Welding (Length is 26mm) 4) The Check and Accept Standard: Both metal seeps, When you destroy them, the foil will stick to the tab (about 80% area)