DIY Spot Welder 9 Gears 18650 [EU] (Banggood, Aliexpress: 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 (the best price with coupon)).
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Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
1. ($39.99): BG3fd745
2. ($41.64): CityadsTool
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG464337, BGWELDTOOL, BGb4e399, BGANI022, BG8a7644, BG4090b7, BG8dc2f7, BGGines, BGPTL088, BG6d2f05
(these codes were not working in latest coupon update, but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – DIY Spot Welder 9 Gears 18650 ($-3)
Price history and price alert
Not enough data to show price history chart… $39.99 is the only recorded price. It was not cheaper than that since we have saved it in DB.
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)).