Hello, I am the creator of this device.
I do not speak english well.
so I do not read all the posts of this forum.
Seems some of you are worried about safety.
I used the lipo as the power source of the welder.
Of course, you can also use deep cycle lead batteries with sufficient capacity.
Lead batteries are also used in Korea.
Lipo fires are well known all over the world.
Lipo must be treated carefully.
This device is a timer that controls the flow of electricity.
Electricity should only flow for as short a time as possible.
when the spot welding is completed (nugget is formed), the battery will be in a shorted state.
Continued electricity will damage the battery.
So I limited the time to 16ms (16/1000 sec).
Do not lengthen the time enough for the nickel to discolor.
Your battery is slightly damaged.
Likewise, lead batteries are also damaged. It's just invisible.
Lead batteries are not 100% safe.
Will there be a fire if the lead battery is short-circuited?
This is just my hobby.
I hope you use it safely.
If you are afraid of Lipo, you can use lead batteries.
If you have difficulty managing the lithium-polimer battery, the 18650 lithium-ion battery management will be more difficult.
The balance of the battery cells of the RC, the electric board and the like should be diligent.
Rather than purchasing a spot welder, please use a regularly sold product.
Thank you. ^^