When you start playing with your flashlights, you'll find that most of these flashlights are actually used for decoration. They didn't use much and still had a bunch of batteries that went to waste. 18650 pack builder If you don't use the batteries for a long time, they will die. Do these batteries work? The answer is yes, and today I'd like to take a moment to tell you about some interesting gadgets that appeared in 18650.

First, Bluetooth speaker

A few years ago, there were a large number of Bluetooth speakers using 18650 lithium batteries on the market, and now it is difficult to buy. Most Bluetooth speakers are powered by a built-in polymer battery. Bluetooth speakers are mostly gray. battery manufacturing machine After some time, you will find that the battery is dead. It is difficult for ordinary people to replace batteries. So I prefer things with replaceable batteries, and I am not afraid of long-term battery collection. This Bluetooth speaker has clock, alarm clock, thermometer, TF card playback and other functions. It can be a pendulum when it's not needed:

Using two 18650 lithium batteries, lithium batteries in parallel, li ion battery construction the battery cover can be opened, can be replaced at any time. The capacity of the primary battery is low, and it is recommended to replace the large-capacity battery to extend the battery life. The speaker comes with a Micro-USB charging port that allows charging without removing the battery:

This Bluetooth speaker is relatively small, low power consumption, sound quality is average. Fortunately, it has many functions and is not expensive. Bluetooth speakers with removable 18650 batteries are hard to find these days. What you can find is what a singing machine like Sundwanlida looks like:

Two, hand warmer

This hand warmer is a brand from Gongtian, one of the few manufacturers still making products such as fans with removable batteries. Now it has been cooled down, which is just what we can use. This is a new product that came out during the previous working time, and I also bought myself a China to try it. There are many different color messages to choose from, but one look is still a little weird:

The hand warmer also uses two detachable 18650 lithium-ion batteries. The original lithium-ion battery also didn't have a very high battery capacity. People can simply choose a battery-free plan back and replace it with a high-capacity backup battery:

The hand warmer has two interfaces, one for charging, and the other A port for discharging, which can be used as a charging treasure. There are two gears, the high temperature can reach 55 degrees, the low temperature can reach 45 degrees. It was used once when it was cold, and the temperature rose quickly, which was suitable for covering hands. Don't worry about batteries. When the external temperature reaches 55 degrees, the battery temperature will exceed 30 degrees:

Three, small fan

This small fan is also produced at Komoda, model GT532S. Komatsu's previous small fan has also been bought, the workmanship is rough, but it can be used, and the workmanship of this GT532S is much better than the materials used before. The fan has a total of 4 gears, the top of the wind is still relatively large, in the summer in the car waiting for a person if enough:

The GT532S fan is also powered by two 18650 batteries in parallel. The official flagship store does not have packaging without batteries, other stores can buy. If there is no battery, you can buy it for more than 40 yuan:

Fan diameter of 14 cm, compared with some other students holding a small fan is much larger, of course, the wind and wind speed is also much higher, I usually study in the car is relatively simple and practical, Yunnan weather conditions is all the year round to use their own, wired charge is also very convenient, do not take the battery. Not surprisingly, this fan system is also one that enterprises can develop as an emergency charging bank:

Four, camp lights, night lights

In the past, there were many camping lights with 18650, and now the factory is generally built in batteries, which is very inconvenient. Not long ago, when I was shopping for batteries, I came across this little camping light and bought one. The lamp has a magnet and a hook. However, the magnetic field is not very attractive, so it can easily fall. Hooks work well:

Unscrew the lid and you can see that the camping lamp uses an 18650 lithium battery. This space has to be designed into two sections, and after one section, the battery life is not so long. There is a USB-C charging port outside the lamp, which can directly charge the battery, but it cannot be used as a charging bank:

The maximum brightness of this lamp is 250 lumens. It's not enough to make a camping light. You have to buy some, but it can be used as a tent light and a night light.

Five, charging treasure

Many charging banks actually use 18650 lithium batteries, but most of them can not be disassembled, and our idle 18650 lithium batteries are not useful. Fortunately, we can buy a power bank case and put it in the battery of the 18650. In the past, this kind of shell was done well by the starting brand. For example, I have only one start-point battery box, eight 18650 lithium batteries, model QD188, the output voltage is adjustable, can charge the laptop. At that time, the notebook did not have TYPE-C fast charge, and there were very few charging banks that could charge the notebook:

Now the quality level of the battery box is uneven, cheap workmanship materials are poor, a better one with fast charging is more expensive than the finished charging treasure, the hand work does not have its own charging treasure, and there is idle battery development, we can try by picking a model:

My treasure box that can be charged with 418650 battery is less than 20 yuan, rough workmanship, good things can be used, there are 4 charging cables on the back, and the car can sometimes be used in an emergency:

Six, DIY other equipment power supply

In addition to being used in these gadgets, those who understand battery circuitry and have practical skills can also use the 18650 in other devices, such as, DIY electric bicycle batteries (note that batteries need the same capacity and internal resistance), DIY refrigerator batteries, DIY outdoor power supplies, and more recently, I just finished a set of car refrigerator batteries, parking can power the refrigerator for 6 hours, more powerful, and can share the production process for free for a few days. In addition to these big projects, it's also easy to make small things. For example, there are 18,650 battery boxes for sale, and there are also those that are connected in parallel and in series. With four 18,650 batteries connected in series at about 16 volts, just like the Yamaha keyboard is also 16 volts, I took a simple battery case, plugged it in, and made an outdoor power supply for the Yamaha keyboard:

Battery voltage can be used reasonably. For example, the synthesizer uses 12V power supply, then three 18650 units can be connected in series, and if one unit is not enough, one unit can be connected in parallel. ...