FNiRST SwM-10 SpotWelder problems! keep getting a SHORT!!!!

I wish my swm-10 worked when i needed to spot weld some batteries 🤷🏻

Product description

Features:
*1 TOUCH WELDING WORK HIGHLY EFFICIENT: The welding is firm and the solder joints are excellent
*DOUBLE PULSE WELDING:Two pulses are released during welding, 1 pulse cleans the oxide layer on the of the weldment to reduce the phenomenon of sparkle spattering, and the other pulse performs welding to ensure the consistency of energy output and effectively improve welding reliability .
*2IN1 MULTI-FUNCTION BATTERY SPOT WELDING： Weldable 0.25mm/Double pulse welding technology/5000mah power lithium battery/1200A discharge
*EASILY ADAPTS TO VARIOUS WELDING:MOBILE PHONE BATTERY, CYLINDRICAL BATTERY, POWER BANK REPAIR, BATTERY ASSEMBLY
*BRASS SPOT WELDING PEN ,PROFESSIONAL SPOT WELDING: The spot welding pen adopts a replaceable design, without need to replace the entire welding pen.
*HIGH RATE POWER BATTERY, HIGH-QUALITY A-GRADE BATTERIES: Equipped with two high-rate power lithium batteries, use high-quality A-grade batteries, and reject B-grade batteries
*1 DEVICE FOR TWO USES, SPOT WELDING MACHINE POWER BANK: Comes with USB 5V2.1A output, which can charge USB devices such as mobile phones
*EQUIPPED WITH INTELLIGENT TEMPERATURE CONTROL PROBE TO：protect your safety in real time
*1.8-INCH FFT HIGH-DEFINITION LCD COLOR SCREEN： Clear display, status at a glanceSmarter, more accurate, more humane

Specification:
Product name:Portable intelligent color screen spot welding machine
Capacity:5000mAh
Charge:5V/2.1A
Discharge:5V/2.1A
Welding materials: Nickel sheet, iron sheet, stainless steel sheet, aluminum sheet
Welding thickness:0.1-0.25mm
Maximum welding current:1200A
Gear:4 combination gear adjustment
dimension:155mm*82mm*28mm

Packing list:
1*Spot welding machine
1*Spot welding pen
1*Nickel sheets
1*Spare needles
1*Manual
1*USB charging cable
1*Packaging