The secret of the 18650 lithium battery you don't know -part 3

4, high voltage

The voltage of the 18650 lithium battery is generally 3.6V, 3.8V and 4.2V, which is much higher than the 1.2V voltage of NiCd and NiMH batteries.

5, no memory effect

It is not necessary to empty the remaining power before charging, which is convenient to use.

6, the internal resistance is small

The internal resistance of the polymer battery core is smaller than that of the general liquid battery. The internal resistance of the domestic polymer battery can even be less than 35m, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone. The level of international integration. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.

7, can be combined in series or parallel to form a 18650 lithium battery pack

8, a wide range of uses

Electronic devices such as laptops, walkie-talkies, portable DVDs, instrumentation, audio equipment, model airplanes, toys, video cameras, digital cameras, etc.

Disadvantages

The biggest disadvantage of the 18650 lithium battery is that the volume has been fixed. It is not well positioned when installed in some notebooks or some products. Of course, this shortcoming can also be said to be an advantage. This is a lithium battery compared to other polymer lithium batteries. This is a disadvantage in terms of customizable and transformable size. It is an advantage over some products with specified battery specifications.

The 18650 rechargeable battery production needs to have a protection circuit to prevent the battery from being overcharged and causing discharge. The production conditions of the 18650 lithium battery are high. Compared with the general battery production, the 18650 lithium battery requires high production conditions, which undoubtedly increases the production cost.

The secret of the 18650 lithium battery you don't know -part 2

Lithium batteries are the same as 3.7V or 4.2V. It’s just that the manufacturer’s labels are different. 3.7V refers to the platform voltage (ie, typical voltage) that is discharged during battery use, while 4.2 volts refers to the voltage at full charge. Common rechargeable 18650 lithium battery, the voltage is 3.6 or 3.7v, when fully charged is 4.2v, which has little to do with power (capacity). The mainstream capacity of 18650 battery is from 1800mAh to 2600mAh (18650 power battery capacity is more than 2200~2600mAh.

What is the use of the 18650 battery?

The 18650 rechargeable battery life theory is cyclic charging 1000 times. Due to the large capacity per unit density, most of them are used in laptop batteries. In addition, the stability of the 18650 is very good at work. It is widely used in various electronic fields: it is often used in high-end glare flashlights, power supply, wireless data transmitter, electric heating clothing, shoes, portable instrumentation, portable lighting equipment, portable printers, industrial equipment, medical equipment, etc.

Advantages and disadvantages of 18650 battery

Advantages

1, large capacity

The capacity of the 18650 lithium battery is generally between 1200mah and 3600mah, while the general battery capacity is only about 800mah. If combined into a 18650 lithium battery pack, the 18650 lithium battery pack can easily break through 5000mah.

2, long life

The 18650 lithium battery has a long service life, and the cycle life can reach more than 500 times in normal use, which is more than twice that of ordinary batteries.

3, high security performance

18650 lithium battery has high safety performance, no explosion, no burning; non-toxic, non-polluting, RoHS-certified; all kinds of safety performance in one go, the number of cycles is more than 500 times; high temperature resistance is good, discharge efficiency is up to 100% under 65 degrees . In order to prevent battery short circuit, the positive and negative poles of the 18650 lithium battery are separated. So the possibility of its short circuit has been reduced to the extreme. A protective plate can be added to prevent the battery from overcharging and over-discharging, which also extends the battery life.

The secret of the 18650 lithium battery you don't know -part 1

A history of 18650 batteries?

18650 is the originator of the lithium-ion battery, a standard lithium-ion battery model that Japan SONY Company set in order to save cost. Among them, 18 means diameter 18mm, 65 means length is 65mm, 0 means cylindrical battery. The common 18650 battery is divided into a lithium-ion battery and a lithium iron phosphate battery. The lithium-ion battery voltage is 3.7V, the charge cut-off voltage is 4.2v, the lithium iron phosphate battery has a nominal voltage of 3.2V, the charge cut-off voltage is 3.6v, the capacity is usually 1200mAh-3350mAh, and the common capacity is 2200mAh-2600mAh.

The 18650 means 18 mm in diameter and 65 mm in length. The model number of the No. 5 battery is 14,500, 14 mm in diameter and 50 mm in length. Generally, the 18650 rechargeable battery is used in the industry, and the common ones are used in notebook batteries and high-end flashlights. According to the type of battery can be divided into 18650 lithium ion, 18650 lithium iron phosphate, 18650 nickel hydrogen (rare), the common 18650 is lithium ion.

What is a lithium battery?

Lithium-Ion Battery: Lithium-ion batteries are widely used because of their lightweight, large capacity, and no memory effect. Many digital devices use lithium-ion batteries as power supplies, despite their prices are relatively expensive. Lithium-ion batteries have a high energy density, and their capacity is 1.5 to 2 times that of nickel-hydrogen batteries of the same weight and has a very low self-discharge rate. In addition, the lithium-ion battery has almost no "memory effect" and does not contain toxic substances, which is also an important reason for its wide application.

In addition, please note that the external lithium battery is generally marked with English 4.2V lithium-ion battery (lithium battery) or 4.2V lithium secondary battery (lithium secondary battery), 4.2V lithium-ion rechargeable battery (charged lithium battery), so users who purchase the battery must look at the signs on the outside of the battery block to prevent the cadmium-nickel and nickel hydride batteries from being mistaken for lithium batteries because they do not see the battery type.

Purple Light Laser: The answer for your daily needs!

Even today, many people question the usefulness of laser pointers. This tool has been known for a long time since a few decades ago but some people still do not understand its usefulness. This tool is very useful for presentation activities, playing with small children or pets, and even stargazing with others (a common thing in Scouting or school break). In short, for some types of activity, laser pointers are seen to be far more effective than if we use a regular flashlight.

Some recent info

Some reports suggest that some European hospitals apply laser pointer to allow doctors and patients with severe brain injuries to communicate with each other. Laser pointers have been used in hospitals widely as a tool to show the words written on the whiteboard. Not only that, this versatile tool is also commonly used as a test of one's consciousness.

In 2014, someone named Brian Palmer explained that he could reduce the growth of green star polyps, valonia, xenia, mojano, and so on only using the laser pointer. All is abnormal growth or more precisely unwanted in the aquarium, and guess what! He used the Purple Light Laser Pointer Flashlight! However, he suggests to anyone who does this trick to avoid direct reflection from the laser beam. They can use special glasses for it.

The question now is, "how do we choose a good laser pointer?" Of course, we can find in the market, various types and brands of laser pointers. Unfortunately, not all can meet all our expectations and needs. This time I will discuss about the purple laser pointers and why you need this tool. You can find more than one brand of purple laser pointers but specifically, I will recommend the brand that you can put your trust on. This product has a myriad of features that complement the various needs for a laser pointer. With a 1-200mw output, this purple laser pointer pen with quality that can be considered as one of the best on the market today and the most economical in its class. This tool is easy to carry because it weighs only 50g. You can put it in your pocket comfortably. The dimensions are also possible for children to carry, only 11 * 2 * 2 in cm.

Its wavelength range

It is a purple light laser flashlight with a 405nm wavelength range, enabling it to be used in a variety of outdoor activities such as field travel (primarily located in dense forests), amateur astronomy activities, mining research, light research in nature, and so on. For indoor use, this tool is also very helpful as an example you as a teacher want to show small objects to your students, make them understand what you mean.

From some of the above explanations, it would be obvious that the laser pointer especially the Purple Light Laser Pointer Flashlight is one of the versatile tools that should always exist in your pocket.

WHY WE NEED A GREEN LASER POINTER

The laser pointer is a device that is handheld and is relatively small that has power source mostly from batteries and a laser diode that emits a coherent low powered laser beam of light which is visible. It is used to highlight something simply by having it illuminated into a small spot that is bright of a colored light. Power is always restricted from exceeding 5Mw.

A green laser pointer is highly different from the other laser pointer colors since it is high-powered, and its frequency is higher and has Rayleigh scattering from air molecules that produce a beam visible to clean air. This happens when viewed in dim lit conditions that are moderate. The other types have a small width of beam and power which is low that brings invisibility to the beam even to areas that have a clean atmosphere, but it relatively shows the small point of light when stroked in opaque areas. Scattering of the Rayleigh intensity increases when the beam is viewed from angles which are near to the beam axis. In the green-light output range, pointers are particularly used for teaching purposes as the astronomical object-pointers. The high power green light laser pointer which is highly powered with high frequency makes a potent signaling tool that produces a bright light for potential search even in daylight. In a vehicle, this could be carried in the emergency kit as a rescue searchlight which is not much expensive.

Features of the Green Laser Pointer

1. Its reliability is high and sturdy.

2. Has the lowest power consumption that uses 2x AAA batteries that can last even more than 3 hours.

3. It is convenient to carry since it has only 55 grams with battery included.

4. It has the green helium-neon(HeNe) lasers that has a power output of less than 1Mw and are much bulkier than a modern laser pointer.

5. It has relatively light weight that has control distance of 5Mw 532nm

6. All green burning laser pointer is currently based on a Diode-pumped solid waste frequency doubled(DPSSFD) laser technology.

7. It is highly visible that is 4 to 5 times that of the 635nm diode laser or 632.8nm red ReNe laser.

Uses of the Green Laser Pointer

a. Serve well in thin places that has a distance length of 5mw 532nm

b. Can be used in vehicles to light parts that are not visible with the eye

c. Can be used for teaching purposes as the astronomical object pointers

Conclusion

Tired of trying different laser pointers which have malfunctions? One time while driving I heard a strange noise in the engine when I opened it through the use of my green laser pointer in my emergency kit I used it for lighting, and I was able to detect the exact problem, and I had it fixed. Try our green laser pointer which is the best in the market and will satisfy all your illuminating lighting problems.

How to decorate your Christmas party by cheap led strip lights? - part 3

Let us move on to most important and excited part! To decorate your own stunning Christmas trees. What is your favorite decoration on the Christmas trees? Mine are led strip lights and mistletoe.

How to decorate the Christmas tree

Before hanging the colorful rgb led strip lights, be sure to check if there is broken mini bulbs. Try to use LED lights, because LED lights produce less heat, and save more electricity. First of all, we will put the smd module light around the top of the tree, and then, and similarly, put the lights go around the tree in circles to the bottom of the tree. A 1.8-meter high Christmas tree takes about six strings of 100 mini bulbs. In other words, a led strip lights with about 600 small bulbs are needed. This number is just for reference.

Relatively heavy decorations should be hung inside the branches, which is near the trunk as the trunk is the most solid and the most load-bearing. And, ornaments should be hung close to the led strip lights. This lights will shine and make the decorations glittering. Things like colored balls, glass balls, metal pendants will have the particularly good reflective decorative effect. Finally, the decoration should be evenly distributed. Do not hang too many decorations on the same branch. Make the best of your

Sweet Reminders:

1.Do not overdo the house with decorative led lights. It’s true that there are various decorative led lights to choose on some online stores, but it’s not that the more is better. Too messy decoration will make the overall decorative effect loses its character. At the same time, it is also a waste of electricity, causing light pollution to the surrounding environment. The lights that are bright but will not lead to the dazzling is more appropriate.

2.Keep it neat. After your DIY project is completed, remember to clean up the unwanted led grow strip lights, tools and other things. At the same time, if there are some light wires on the ground, also pay attention to remind your guests, especially children to pay attention. Children love to run around the lawn, which can be dangerous if they come across the wire. Therefore, it is best to place the wire in more hidden places, so that it will not leave any security risk.

How to decorate your Christmas party by cheap led strip lights? - part 2

Carefully check the led strip lights before you start

Before you place the ladder and are ready to hang the lights, make sure all the led strip light accessories work and there are no areas of wear in the wire. Although the strip light is not as expensive as other lightings, choose the reliable, better quality retailers are still the best choice. At the same time, if the power cord or led switching power supply has quality problems, it is easy to cause short-circuit, more serious, will lead to the problems of other lights at home. Do not try to repair worn wires. If you find a damaged wire, the entire line should be replaced, which is definitely easier than saving a fire. You know, safety first.

Place the power supply closer to the edge of the roof

You can put the led power adapter switching in the corridor because most houses do not have power switching outlets on the roof. You need at least one good external cable. Choose a light-string compatible external cable and make sure it withstands wind and rain.

After finishing the work on the roof, decorate your home's other places

Use the corridor railing as an example. The method of decorative cylinder similar to the led module lights around the railing. If you need to fix them on it, you can try the clay. Clay can be bought in good hardware stores.

Note:

1. Be careful not to be scalded by the light bulbs of the led strip light accessories, and also prevent your pets, kids, green plants and others are scalded.

2. Caution power overload! This is a frequent accident that will always happen during Christmas, which can cause a fire in severe cases. This is what we don’t want to see mostly in the festival. So enjoy the party, but at the same time, also have the awareness of security.

3. Do not turn the lights and the on all night, especially those hanging on the real trees. Before going to sleep, you must first unplug the usb led strip lights to ensure that all the power has been turned off.

4. If you want to fix the led strip lights, try to use the led aluminum track light to hold them.