14 Amp Hour / 140 Watt Hour Lithium Ion Battery - lithium ion battery price

This is a 1S14P lithium ion battery pack made of 18650 s in a laptop.
2 amps or 10 watt hours per 18650 batteries.
14 18650 s and behave 140 W hours and 28 amp hours.
I think the biggest reason to follow this note is that by the end you will have a stand-alone package and charger that fits perfectly into this project box.
Size is 6x4X2 inch.
Here is the name of the project box on ebayaluminum project electronic enclosure box 6x4x2, and since I started using the battery pack, I have learned a lot about math.
Note that mathematics is only in the fourth grade, but it is very important.
In all the instructions, I explained the numbers involved so that you can make your own packaging better.
"Amp Hours" means how many amps can be drawn from the package in how many Hours.
Single 18650 is 2. 6 amp hours. 2.
You can pull 6 amps in an hour.
Different currents can be drawn in almost the same proportion.
Can Draw 1 amp for 2. 6 hours.
In fact, depending on how much current is drawn from the battery, the capacity of the battery is different.
The more current drawn, the lower the capacity.
This is because the Heat loses more capacity at high currents.
Below is a large collection of discharge curves of different 18650 seconds.
If battery University, learn about another resource for various batteries.
"Watt hour" means how many watts can be drawn from the package within how many hours.
A battery of 18650 is 10 watts.
You can draw 10 watts from 1 Watt in 1 hour or 10 watts from 2 watts in 2 hours.
My package is 140 W hours, so you can spare 20 W in 7 hours.
There is an upper limit on power consumption.
If I draw more than 140 W/28 amps of current from the package, I will be at the maximum current load of the package.
Before I get close to this, although the package will be turned off as the PCB only allows the drawing to be no more than 8 amps.
This package is designed to power low current equipment for a long time.
Amp Hours and Watt hours can be converted back and forth using the formula Volts x Amps = Watts.
If you have a 10 am p hour battery, you can convert it to a watt hour by multiplying it by volts.
10 am hours X 3.
7 v = 37 W hours.
If you have a 64 watt hour battery, you can get an amp hour by dividing it by the nominal voltage.
64 watt hours/14.
Nominal voltage of 7 volts (group of 4S) = average voltage of 4 amps per hour.
As shown in this manual, the 1 s battery configuration varies from 4 to 4.
2 volts (charging) to 2.
5 volts (discharge ). 3.
7 is the average voltage.
In the 4S configuration, the voltage is from 9. 6 to 16. 8 volts (14. Nominal v.
There are several reasons why 18650 people have different abilities. 1.
It's cheaper to make batteries with lower capacity.
The older it gets, the less advanced the technology that made them at that time.
In the 200 charge cycle, 18650 accounts for only 80% of its original charge. The new 18650 is 2.
6 amps/10 watt hours.
For simplicity, I will use these numbers when referring to the capacity of my package.
Keep in mind that these numbers apply to the best case scenario.
Can you mix cells of different capacity?
You shouldn't do that, but it's okay.
In a perfect world, you will use batteries of the same manufacturer, of the same age, of the same capacity, and you will get higher capacity batteries.
Because this project is done on its own for low cost, mixing capacity is OK.
The new 18650 will cost $140.
All of mine is free.
The average amp hour capacity of a single cell in my bag is 2 amp hours.
This gives the theoretical maximum capacity of 14x2 = 28 amp hours for my bag.
I use the electric energy meter to drain the package to measure the actual capacity and the result is 21 am p hours, or the theoretical capacity of 75% which I am satisfied.
My brother works in a lab at a university with access to their emailwaste dumpster.
People threw away the damaged laptop without knowing the battery was still available.
If you can't use a bad laptop, you can sometimes find used 18650 on Ebay for $1 or $2 per unit.
You can also buy new ones.
Then they were about $10 each.
New 18650 for Batteryspace.
3 amps 4 is being used by ComI.
2 Volt charger for Batteryspace.
The battery pack is 28 amps, so it takes 9 hours to fully charge in the case of 3 amps.
It would be more practical to use a larger charger here.
The 18650 s can be safely charged up to 1C.
C is the charging standard.
Single New 18650 is 2.
6 amp hours, so it is possible to charge up to 2 safely. 6 amps (1C).
Since the entire package is 28 amp hours, it is possible to charge safely at speeds up to 28 amps.
It's a bit scary if you ask me.
With the charger my bag is charging.
There is also a 6 amp charger on 1 c batteryspace, but it is 3 times the 3 amp charger.
It doesn't fit my project box.
It will still be fully charged overnight.
You need a PCB before assembling the battery.
The most important function of the PCB is to ensure that the package does not drain under 2. 5 volts.
Lithium ion is a volatile chemical compared to standard alkaline batteries.
If you discharge a lithium ion battery under 2.
5 volts will be "broken" and will never be charged again.
If short circuit, the pcb will also turn off the circuit.
It prevents overcharging and attracts too much current.
All of these things can cause damage to the battery, or the worst case is a fire.
The 18650 is very safe.
Look for "over 18650" on youtube ".
You can't find something really exciting.
On the other hand, looking for a lithium polymer that has been charged, or puncture a lithium polymer, you'll love some real fireworks.
This is the pcb I use.
Simple PCB wiring.
There are only 4 contacts on the board.
2 for pos and neg in the battery, and the other for pos and neg to the charging/discharging terminal.
Charge the battery through the PCB to reduce the risk of overcharging.
The smart charger cannot be turned off automatically at the right voltage.
I soldered the charger to the charging/discharging terminals.
This is a 1S14P lithium ion battery pack made of 18650 s in a laptop.
This makes the voltage range between 3. 6 and 4. 2 volts.
What are you going to do with this voltage range?
You might be asking yourself. 1.
The battery pack is not that complicated, so you can make it smaller.
You don't need balance sheet 3.
New developments in the DC boost converter allow you to lift the voltage to a more available voltage. 4.
In the range of 2. 5 to 4.
It is easier to charge low voltage with solar, wind, USB or bicycle generator voltagesI. Use this battery for my flat bike.
It provides energy for my light.
The light is Cree xm-lL T6.
You can find them on Ebay for $10 to $20.
They are very smart.
I take it off my terminal and weld the wire to the metal body of the positive and negative contacts.
I can insert it into the package with RCA plug.
The connected hardware is two pipe hangers for Home Depot.
Under normal circumstances, the lamp is powered by 1 18650 for an hour.
Parallel to 14 batteries, it lasts 14 hours at full brightness.
Recently, there have been countless new DC boost products on the market, all of which have very low prices.
Search for DC boost on ebay to see what you came up.
Here are some of the names I found on Ebay so you can find them more easily. Boost DC-LM2577DC voltage step
Up power converter 3-34V to 4-35VDC-
DC step-up buck converter 3. 5-28V to 1. 25-
The first of the 26 V buck boost voltage module is 2 amps and the second is 1 amp.
Because the capacity of this package is very large, you should get the DC boost module with the highest current you can find.
As long as it can raise the voltage to at least 3.
It will work 5 V (lower limit of lithium ion ).
Most of the time, the efficiency of the DC boost converter is 80% when converting 3 volts to 5 volts.
This is a bit inefficient, but it doesn't matter because of the size of the battery and the small current consumption of the USB device.
Consider a mobile phone, for example.
My mobile phone is 5.
5 W/1200 mA hours.
I use the electric energy meter to make sure my phone consumes 2 watts while charging.
Because the efficiency of the DC boost converter is 80%, its power is 20% higher than that of 2 watts, 2 watts. 4 watts.
The battery pack consumes 20% more energy than my phone.
Charge for 5 W hours, that is, 6 W. 6 watt hours.
The battery pack is 140 watt hours divided by 6.
I can charge my phone for 6 watt hours is 21 times.
However, since my battery is old and since the actual battery capacity is always less than the theoretical capacity, I should really expect a theoretical capacity of 75%, which is 15 times as much as I can charge my phone.
I put a 4 port USB hub outside my project box.
I am using the 2 amp boost module.
The standard USB power is 500 mA, so the boost module can power 4 USB devices at the same time.
This way I can charge my phone, gps device, camera, external speaker at the same time.
The lower limit of most DC boost modules is 3.
5 V, lithium ion battery can be discharged to 2. 5 volts.
This seems like a problem, but this is not the case.
When the voltage drops below 3, the capacity of 95% has been used. 5 volts.
Okay, you go.
Please feel free to ask questions if you have any questions.