I’ve been looking for a cheap battery tab spot welder for 18650 lithium-ion cells for awhile now. The usual ones just aren’t worth the cost. Enter the $16.99 Portable Mini Spot Welder! At that price, it was worth a shot. Will it sink or swim? Watch to find out!

In this video, I discussed the principle of operation of the BIFRC DH20 spot welder and demonstrated its capabilities. I also did a teardown and analysis of the unit. Product link: https://ban.ggood.vip/10GYB

00:00 Overview
04:59 Welding test with different settings/tips
08:22 Principle of operation
12:20 Output waveforms
15:52 Welding current measurement
19:13 Teardown
22:12 Conclusion

You can make a ton of current modifying a transformer, but with little voltage, it means little!

[Kasyan TV] over on YouTube was given a pile of spare parts in reasonably large quantities, some of which were useful and allocated to specific projects, but given the given the kind of electronics they’re interested in, they couldn’t find a use for a bag of 500 or so low specification 470uF capacitors. These were not low ESR types, nor high capacitance, so unsuitable for power supply use individually. But, what about stacking them all in parallel? (video, embedded below) After a few quick calculations [Kasyan] determined that the total capacitance of all 500 should be around 0.23 Farads with an ESR of around 0.4 to 0.5 mΩ at 16V and packing a theoretical energy total of about 30 joules. That is enough to pack a punch in the right situation.

What can be made from 500 capacitors ?
https://www.youtube.com/watch?v=LdklXOSjQD0

Batteries are amazing. Batteries are horrible. Batteries are a necessary evil in today’s world of portable everything. If you’re reading this sentence, even if it’s not on a mobile device, somewhere there is a battery involved. They’re that ubiquitous. There’s another thing batteries are: Expensive! And at $350 each for a specialized battery, [Linus] of Linus Tech Tips decided to take battery repair into his own hands.

Rather than do a quick how-to video about putting new cells in an old enclosure, [Linus] does a deep dive into the equipment, skills, and safety measures needed when dealing with Lithium Ion cells. And if you watch the video through, you’ll even get to see those safety measures put to good use!

This should be illegal… Battery Repair Blocking
https://www.youtube.com/watch?v=Mkum7G-0vWg

In this small project I will show you how to create a DIY USB Type-C PD powerbank the super simple way. To do that I will firstly test a powerbank PCB based around the IP5328P IC I got from Aliexpress. The measurements will show us how suitable the PCB is for creating a DIY powerbank. Afterwards I will then show you how I created a Li-Ion battery pack and a custom 3D printed enclosure before I will put all the components together to form the powerbank. Let’s get started!

https://www.instructables.com/Building-a-USB-Type-C-PD-Powerbank-the-Super-Simpl/