how to make a 12v battery for free - home battery pack

That's what I did. 12 v li-
Ion batteries are free without having to buy any batteries from the Internet.
I use these in all teaching projects that need some kind of battery, it's cheaper and can usually store more.
One of the best places to get batteries that are no longer in use but have large capacity and large power output is laptop batteries, which are usually li-
Ions, since they are the lightest of each power output, are generally good.
If you have any old laptops that are no longer in use, then use them, if you have a laptop whose battery shows no charge, what's the point of keeping it, rechargeuse it.
The cell phone battery is also good, but usually there is no good capacity because they are designed for the phone, although there is the best power-to-weight ratio, but because it is very small, they don't output much power these batteries are good for small projects.
This only works for your battery in this case.
I strongly recommend not to take apart the cell phone battery because the battery under the metal itself contains harmful acid.
So first of all, you take down all the stickers (
Make sure you enjoy the invalid label of cancellation warranty)
After that, use a sharp but sturdy flat head screwdriver to pry open the plastic.
I suggest you buy an old pair of pliers and wire cutting machine and you don't mind prying the plastic a little until something breaks and it's one of the hardest parts.
Remove the tool immediately if you see the spark!
After removing the plastic, there will be a lot of other garbage in the package, which will only be removed before each battery pack is removed.
So when you have cells, only cells (
I use the term "battery" because there is more than one battery for the battery)
Decide the voltage you want the battery pack, this is the voltage list for each battery number: Battery/voltage 1-3. 72 -7. 43 -11. 14 -14. 85 -18. 5etc. . . .
You add each cell of another 3. 7v you add.
Please note that the lithium battery can rise to 4 volts and drop to 2 volts.
9 v, never overvolt or under-
Voltage-sensitive electronics with a specific voltage.
To get a stable voltage, use a voltage regulator like this: if you want to get more "power" in the battery pack ", but there is no need for the voltage to have the same number or more spare batteries as you, connect them so they are parallel, parallel is the location of two or more batteriesto -.
If you have a lot of tape then wrap them in but if you don't have the tape you just need to make sure and-
Do not touch, as this will short the battery, which may cause the battery to explode or catch fire, but usually reduce the capacity of the battery.
Check everything is OK and charge with battery rated power Eg.
12 v psu is required for 12 v batteries (
Power unit, this can be anything from powering the computer to the phone charger, just keep in mind to check both voltage)