Product Weight: 302g, Battery Capacity: 5500mAh, Package weight: 407g, Welding Output: 4.2V MAX 650A, Material: Metal Case, Charging Port: Type-c, Name: Spot Welding Machine, Product Size: 103x 83x 29mm, Package size: 143x 107x 48mm, USB Output: 5V MAX 2.4A.
Price history, coupons and price alert are available on this page. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now.
Link: Banggood product page
1. ($39.99): BG3fd745
2. ($41.64): CityadsTool
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG464337, BGWELDTOOL, BGb4e399, BGANI022, BG8a7644, BG4090b7, BG8dc2f7, BGGines, BGPTL088, BG6d2f05
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIY Spot Welder 9 Gears 18650 ($-3)
Price history and price alert
Well, you won’t see price history chart, coz we have only 1 database record for this item (and price was $39.99).
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).