Recycled 5v Power Supply

This battery pack is made from a old battery pack and a old laptop battery.

Tools:

knife

soldering iron

solder

wire stripper

hot glue

Step 1: Extracting the Charger Circuit.

Get your old battery bank and pry it open to reveal the charger circuit.

If you do not have a battery bank on hand you can buy a battery bank from the dollar store for $3(like i did)

Step 2: Getting 18650 Cells

Get a old lithium ion laptop battery pack and pry it open, inside you would find some lithium ion cells.

if you do not have a old battery pack then you can order some 18650 cells online, be sure not to get a cheap cell as most of them are used or counterfit.

Step 3: Battery Cells

Hot glue the cells together. Then glue a stripped down wire onto one end of the battery. You can put any amount of cells you want, as commenters suggested leave the tabs on the battery

Step 4: Soldering

solder the wire into one end of the battery, then repeat the proccess for the other side

Step 5: Pcb

hot glue the pcb onto the battery, then solder positive to positive and negative to negative.

wrap electrical tape around the terminals and make sure the contacts don't touch.

Step 6: Finished

Wrap it in electrical tape and you are done.

Comments

[cainvsc]

Does anyone know if there are any charger modules like that sold on Ebay?

[NicolasK11]

They do. Search for step-up AND charger. Ali express also has them.

[happyhippy1]

https://www.instructables.com/id/Fake-USB-Prank/

tell me what you think

[Omnivent]

Soldering directly to a lithium cell sure deserves a Darwin Award Nomination.

Tabs should be spot welded to it first (a spot weld doesn't heat the cells as much as soldering) and then you can solder to the tabs.

Please don't lure others into burning down their house (and themselves)!

[AlexZhang]

If you use flux and you are quick enough the cells dont heat up.

[Omnivent]

I have to strongly disagree!

And using unleaded solder isn't keeping the temperature down either.

Why not simply use spring loaded terminals?

Don't take my word for the dangers of lithium runaway, but read this,

This

And this

And then wake up and smell the coffee.

[AlexZhang]

They dont heat up, and they are more robust then you think

[Omnivent]

Hi Alex,

Rather than going all defensive expressing pure nonsense, you could consider this as part of your learning curve, but that's up to you of course.

What's not up to you, however, is to tell me what I think. When it comes to potentially dangerous things, I don't just think, I seek and get real knowledge.

You seem to think that they're robust enough to solder and have been lucky that they didn't incinerate right in your hands, but the only way to know stuff like that is to take a bunch of cells and do destructive testing on them - and then cut them open and do a forensic examination on them. To put it short, you'll never know how many degrees you were from *kaboom*, but you will have impaired their capacity and life expectancy - Soldering blobs like you used don't cool immediately when you remove an 800°F hot iron and most of the cooling of the blobs happens by conduction, rather than radiation, so the heat builds up inside the cell after you remove the iron.

Please play it safe, electronics is more fun if you don't harm yourself in the process.

[AlexZhang]

ok i will edit the instructable

[AlexZhang]

Its not recommended but you can solder to lithium cells

[Omnivent]

It's not recommended to suck on the business end of a gun while you fire it, but you can do that too (although only once ;))

[edward.ells]

good reading!

[happyhippy1]

Great Job. But it would cost less to buy a portable charger online.

Still I might just make one for the fun of it.

Great job!

[AlexZhang]

It costs less as long as you have a old laptop battery. I made this 4000mah battery pack for $3