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I am Allen. I like Music and Football. My Facebook: https://www.facebook.com/heling1682002

2016年7月31日星期日

How to make a power bank with used laptop battery?

In this tutorial I will show you, how to harvest the 18650 battery from any of the old laptop battery pack you might have. Most of the time, laptop battery packs go bad when just one or few cells in the pack are dead. The protection circuit in the charging board cuts out the entire pack as a necessary protective measure for the user. There are still a few good cells though.At last I will show you how you can make a power bank by reusing these salvaged batteries.





Disclaimer: Please note that you are taking apart battery packs in this tutorial which is expressly discouraged by the manufacturer as this is potentially a very hazardous process. I cannot be held responsible for any loss of property, damage, or loss of life if it comes to that. This tutorial was written for those who have knowledge on rechargeable lithium ion technology.Please do not attempt this if you are novice. Stay Safe.

Picture of Gather The Tools and Parts
Old Laptop Battery:
If you do not have,you can ask to your friend or relatives.
You can also find it from any computer repairing stores.
Power Bank Case:
You can buy it from eBay.
Tools :
You needs only few basic tools for disassemble the battery pack
Safety Equipments :
1. Gloves

2016年7月28日星期四

How does the Power Bank work?

Power banks are devices that are used to charge mobile phones, tablets, laptops, mp3 players and mp4 players anytime and anywhere. With the use we subject are devices to, it is important to have a power bank to be able to keep these devices up and running all the time. Power banks can give you uninterrupted access to play games on your laptops, instant message on the internet, use social networking platforms and book airline, train and bus tickets at the drop of a hat. There are certain specifications that you ought to keep in mind before laying your hands on the ideal power bank for your need. Grab a power bank that is double in battery capacity to be able to charge your mobile phone, tablet, laptop, mp3 player and mp4 player at least once. Today I will introduce you How Does a Power bank Work? To understand things a bit better, let’s take a look at a block diagram of how these devices work, after that we will see some of the major and minor components of it.
Major components:
Moving on to the main question, How does a power bank work? To my knowledge all of these devices use Lithium Ion/Lithium Polymer battery as their power source, so in the inside they have these type of batteries, remember this is the same type of battery that is inside of your phone, tablet, laptop or most of the portable devices that we use these days. These cells are so popular and widespread due to their high weight to power ratio, Lithium batteries can provide about 300W per kg where the other ever popular lead acid can only do 180W per kg. So more power, less weight that’s what is needed on a portable device.
So we have got the battery for such devices, lithium ion or polymer, now we need to make sure it can provide proper voltage and current to the device. Lithium cells has a nominal voltage of 3.7V and can go all the up to 4.2V while fully charged, but the USB ports that we use has 5V with strict regulation. So we need to change this cell voltage to 5V. How can it be done? Usually it is done by a boost converter that provides a steady 5V on its output regardless of the battery voltage being at 3.7V or 4.2V or anything in between them. If more than one cell is used, what I have seen is manufacturer uses them in parallel, so they can use the same circuit just have better service time. Although the one that I made, I used two 18650 cells in series and use a buck converter to lower the voltage to 5V. Either way output voltage is 5V, we got it on USB so we can charge any device. Another important thing about this boost converter is, it usually limits the output current too, depending on the circuit it can provide different amount of current. In some cases, where it is suppose to charge a laptop however, the output voltage can be 12V or 19V depending on the model or depending on the device that it’s manufacturer is aiming at. So we have a power source inside and a circuit that can provide our desired voltage and current, everything is fine so far but we need to charge this cell right?
So next part, charging the battery that is inside of them. Charging a lithium ion is a bit tricky. You have to make sure to put proper voltage and current in and change the charging profile when necessary and you have to control the voltage otherwise it can blow up! Lithium ion takes a steady/constant current up until they reach their 60-70% capacity then it charges at a constant voltage, steadily declining the input current to them. So you need a charging circuit that have such ability. Also it is safe to use a charging current that is half of it’s amp-hour rating. For smaller capacity power banks, usually an USB input is provided for charging it up, as smaller capacity devices have smaller cells it is easy to top them up with a smaller current from any USB port. Larger capacity ones however include their own power brick or AC adapter with them to charge it from AC main line.
Now we have a working power bank that can take in power from USB or an AC adapter(similar one that is found with any phone, tablet or laptop, but might have a different output voltage) and charge a battery inside it and can power your device using that stored energy. Done? Not really, there are some more bits and pieces of stuffs in their. Let’s talk about them.
Minor components:
Usually these devices, or at-least the good ones have indicator that shows the battery percentage, so you can see how much power it has left or should you charge it or not. So we need a circuit that can sense the battery capacity and show us by maybe a multi-color LED or maybe a bar graph or maybe with a LCD. This circuit will also tell us when it is fully charged so we can unplug it. Some of these devices have some built in meters for measuring voltage and current, usually on the output section and they use LCD or LED display to show that. Some more advanced ones can even show how much time left for it to power the load that is connected to it. Without these circuits, the power bank will still work but they make stuffs a lot easier and more suitable for using.
There are some more circuit to ensure the safety of these devices, like temperature sensor or current sensor. What it does is while charging or supplying a load it keeps on checking the battery or the circuit temperature to ensure that both of them are within their standard operating range, if something goes sideways it automatically turns itself off. They also measure output current too to see if the output current is within it’s limit, if not, it will automatically turn off. Another protection circuit is there to protect the battery from going below a certain voltage level, some battery has this protection built in but if it doesn’t have that circuit it might be added to the design to ensure good health of the battery.
This is pretty much how does a power bank work, but all the circuit blocks that I have mentioned here might not be available in many designs but reputed manufacturer will have them for sure. There are huge amount of power banks available with many different capacities and it is pretty overwhelming in most cases to select the perfect one. Yet simple advice go for the reputed manufacturer or the one with better warranty policy. Some power banks might come with torch light too, get them if you find it necessary.
Some power banks might have wireless or induction charging that uses different circuitry to make magnetic field to transfer power, This post is already kind of long so won’t get into details.

2016年7月11日星期一

How to know Power Bank is Fully Charged or Not?

Power bank is so important to us as we are living in a world of mobile electronics. It allows us to move freely and charge our devices anywhere. There’s no doubt that we need to charge our power bank when energy is running out. However, not only said by the supplier but also declared on the manual brochure clearly — don’t overcharge your power bank.
Negative effects of overcharging your power bank:
1.Possibly shorten the lifespan of your power bank. Overcharging will cause overheating, at an average temperature of 32 degrees fahrenheit, for example, a lithium-ion battery will lose six percent of its maximum capacity per year. At 77 degrees, that number jumps to 20 percent, and at 104 degrees it’s a whopping 35.
2.If the power bank is not under power protection which ensures that the battery stops charging once it has reached full capacity, overcharging will be extremely dangerous, it might explode in a very bad way.
Most of power bank are designed to entail: power protection, short circuit control and temperature control.
How to know power bank is fully charged?
According to the manual book it will be simple enough, only need to check the indicator. Most power banks have a built-in four LED lights indicator. The LED light sparks once the power is connected and all four LED lights stay on when the battery is fully charged.
How to know power bank is fully charged if the indicator is not working?
With a broken indicator, for instance, no light at all or cannot stop blinking, you might get confused to know whether the power bank is fully charged or not. Here are some vital items to follow:
1.Find the manual brochure of your power bank or download one from official website to check how many hours are required to fully charge your device. Use your power bank up to about 0% juice left, as the indicator is not working you need to connect the power bank to any compatible device to test if there’s any power left.
2.Connect your power bank to an appropriate charger–generally most power banks require 5V 2A input so the corresponding charger would be the best choice to charge them. Avoid charging with computer USB port. Different charging methods may result different charging time , charging with the original charger will be faster than charging with computer USB port.
3.When the expected charging time is up, disconnect the charger and apply any compatible device to your power bank and test whether the power bank was charged. If it works smoothly, the rechargeable cycle is alright, however, the indicator is dead, we cannot make sure your power bank is fully charged, at least it’s definitely not overcharged for the safety concern. If it’s not working at all, the power bank is likely to be damaged, you need to contact the customer service center to fix it or buy a new one.

Top 5 best waterproof power banks 2016

No matter either water or smartphone, we all can’t live without them. While taking to power up your smartphone till the last drop of water, we have portable power bank; and furthermore, we have portable waterproof power bank with a certified water-resistant rating. These rough but tough power banks are not only built to take a beating, but also packing up additional power to your smartphone or tablet when there’s no outlet nearby.
What a joke is that not all people could buy a waterproof Galaxy Edge S7 without hesitation, while any of you could have an affordable waterproof power bank at any moment.
Dive in as we’ve rounded up the best waterproof power banks for your summer accessories packing list.
Do remember to charge up this ZeroLemon SolarJuice Power Bank before heading out for a complete backup of 10000mAh. If draining it while you’re out in the wild, let the sun do the rest. The built-in lithium polymer battery charges via the 1.2W mono-crystalline solar panel when there are no outlets to be found, and it’s completely waterproof and shockproof. Besides, a LED flashlight would help you venture into the darkness for a nighttime emergency.
Great for just about any activity, water-related or not, the UNIFUN power bank holds an impressive 10400mAh of battery life while away from a regular power source. Featuring an IP66 rating, similar to that of Galaxy S7, it’s completely waterproof and shock-resistant.
Both rocking an impressive IP67 protection rating, the EasyAcc 9000mAh/ 20000mAh waterproof power bank come in handy for camping, hiking, climbing, fishing or beach days. There’s no fretting when taking a dip in the drink. Along with its built-in flashlight, they also come with a compass, carabiner clip, and carry strap.
Packing up an enough power capacity of 10050mAh, it still packs all the same waterproof (IP66 rating) and shockproof features, making it such an ideal companion for single-day hikes or fishing trips and absolutely be your savior if caught in a sticky situation.
What’s your favorite rugged/waterproof power bank? Or do you have eyes on a differentportable power bank? Either way, we’d like to hear what your go-to power bank for those wet and extreme conditions. Comment Below!

Best Power Bank for VR

In the last article we introduced how to choose a power bank for your VR. So here we would like to list a couple of power banks which charges your VR best. All power banks below supply at least 2.0A of current at 5V. And also do that across the entire charge of the battery.
Aucky’s 10400mAh power bank is made by premium material and Sony cells, therefore equips with superior quality and supports 1000 using times. Over-current, overcharging and overheating are protected from due to the multiple built-in safeguards. In addition, with the Quick Charge 2.0 technology, this power bank charges devices up to 75% faster than standard chargers.
Forget about the old-style power bank.You deserve this New Fashion Design with the same metal technology as iphone6s. Smart and fast charging with 2A & 1A Stable charging port.Add almost 4 charges to an iPhone 6 or 5s, or two full charge to a 6 Plus, Galaxy S6, Note 4, Nexus 5 and other smartphones. Portable, Super Slim, light wight and compact designs make it more convenient to carry in your pockets or purses.
As different products of the same company Samsung, this power bank enjoys more advantage in charging Samsung’s VR. Can charge most microUSB smartphones up to 3 times with LED indicators showing how much charge is remaining on your Battery Pack.
The built-in Smart technology intelligently detects your devices and delivers the fastest charge. The power bank charges two smartphones or an iPad at full speed (Smart Output : 5V 2.4A) and recharges in 6 hours with a 2A adapter (not included). What’s more, it compacts with Apple, Samsung, HTC Smartphones and Tablets, and other devices with USB Charging port. Easy to hold in your hand and put anywhere you want, e.g. a pocket or bag.
Utilizes Smart Technology by optimizing charging current (up to 3.5A), the dual ports will intelligently and quickly identify your device to meet its unique charging needs. This power bank also constructed with Li-Polymer battery which is long life, no acid leaks, and fully compliant with international safety standards.

Best Power banks for iPhone 5se

Xiaomi Mi 10,400mAh Power Bank
— aluminum casing with battery cell technologies from LG and Samsung;
— around 5 times while charging up iPhone 5se;
OnePlus 10,000mAh Power Bank
— sleek lines, gentle curves, battery LED indicators;
— LiPo battery cell for iPhone 5se to be refilled of power for 4 times;
Anker PowerCore 10,000mAh
— PowerIQ and VoltageBoost technologies for fastest possible charge up to 2.4 amps;
— over 3 times to give iPhone 5se full charges;
Mophie powerstation 5X 10,000mAh
— aluminum construction and Bluetooth power monitor;
— could provide iPhone 5se 3 full charges
— Smart charge that automatically and intelligently detect the devices connected and output the perfect amout of power at fastest possible speed;
— up to 7 color mix for different lifestyle;
Best seller in 2015, EasyAcc 10,000mAh 2nd Gen. Smart Power Bank
Welcome all of you comment below with the Best 10,000mAh Power Bank you’ve ever brought; or you are charging now; or you wanna buy at the moment