Overview of 18650 batteries for different devices, conversion of the battery to a screwdriver, best batteries with Aliexpress
TEST:
To understand if you have enough information about a lithium-ion battery:- When purchasing 18650 batteries for a flashlight with protection, which manufacturer is preferable?
- What indicators should give chargers for 18650?
a) The output is 5 volts and the current is from 0.5 to 1 of the nominal capacity of the battery itself.
b) The output is 10 volts and the current is from 1 to 3 of the nominal capacity of the battery itself.
- In what temperature range is it desirable to store the battery?
a) + 10 - + 25 - ideal indicators. The battery does not tolerate too cold or hot rooms. b) At a temperature of +20 - +45 degrees.
- How many stages does a lithium battery go through?
a) Two.
b) four.
- How many charging stages does a lithium battery have that takes less than an hour to charge?
Answers:
- b) It is advisable to take Chinese KEEPPOWER batteries. Samsung does not release protected models.
- a) The correct output indicators are 5 volts and a current from 0.5 to 1 of the nominal capacity of the battery itself.
- a) + 10 - + 25 - ideal indicators. Do not place the battery in other conditions.
- a) Two stages - first with a voltage of 0.2-1A, and then with a high constant.
- a) Only one. The element is immediately applied high voltage. The rest of the steps are missing.
The problem of nickel-cadmium battery, installed in a screwdriver, in that it must be constantly used. If the battery is completely discharged or not used for a long time, then the crystallization process will begin in it, and the battery will soon completely fail.
To replace battery you will have to spend a lot of money, since batteries suitable for a screwdriver are not cheap.
For these reasons, screwdriver owners modify the battery a bit to connect lithium cells to it. But before starting such work, you need to think about whether it is necessary to make such an alteration and whether it is advisable at all.
Definition: Battery 18650 is a 3.7V battery.
3 pros and 5 cons of alteration for a screwdriver
Benefits of a remake:
- The energy density of the elements will become better than nickel-cadmium. It means that screwdriver will retain its original weight, it will even be somewhat lighter, while output voltage will remain within the normal range.
- Lithium accumulators charge much faster than others. It only takes one hour to safely charge them.
- For lithium-ion batteries no memory effect. From this we can conclude that it is not necessary to completely discharge them before installing them on the charger.
Flaws:
- If you install lithium battery, it will have to be carefully monitored: when charging - above 4.2 volts it cannot be charged, and discharged by less than 2.7 volts. Otherwise, the battery will simply fail.
- 18650 cans are used as lithium elements. They are different from nickel-cadmium in size. In addition, you will have to find a place for the charge controller discharge wires. And all this should somehow fit in the body of the screwdriver.
- Charging for cadmium batteries may not be suitable for rework. You may have to additionally look for a universal charger.
- It will not be possible to work outdoors in winter, because the lithium battery does not tolerate negative temperatures.
- Li-ion battery costs more than cadmium.
It is also important to know 3 nuances before starting work
- First you need to determine the number of elements in battery. It is best to use 4 elements, since three will only give 12.6 volts.
- Collecting the battery 18650, pay attention to the capacitance and discharge current. When the battery is running, the current consumed is in the range of 5 or 10 amperes, but if you sharply press the power button, it can jump up to 25. This suggests that the maximum value of the discharge current should be approximately 30 amperes on the battery 18650.
- You should also pay attention to the controller. Its characteristics must be rated voltage and current discharge. For a 14.4V battery, the controller is the optimum voltage. The operating current must be several times less than the maximum allowable.
How to avoid 4 mistakes when assembling a 18650 charger
To properly connect to battery lithium cells, you will need to follow the instructions exactly:
Chargers for 18650 batteries
For battery The 18650 will have to use the correct charger. At the output, it will produce 5 volts and a current of 0.5 to 1 of the nominal capacity of the battery itself. If lithium cells support 2600 mAh, then a current of 1.3-2.6 amperes should be used to charge it.
device for lithium batteries charge the battery in several stages:
- First on battery a voltage of 0.2-1A is applied.
- Further charger already passes at a constant voltage.
If the charger has impulse mode, it will greatly speed up the charging time.
In the event that the battery has graphite, then the voltage should not exceed 4.3 volts per cell. If this indicator is exceeded, then the energy density will increase, and the oxidative process will begin.
There are lithium batteries, charging in less than an hour. They do not provide for the second stage - the current is immediately supplied by 80% and after that it starts to work. This is normal for a lithium type battery.
Answers to 5 frequently asked questions about choosing an e-cigarette battery
Battery
Look at the picture battery 18650 for an electronic cigarette. It is quite difficult to find the right sample battery for an electronic cigarette, since there are many varieties with varying degrees of power. For example, long-term, but they cannot be turned on at full capacity. Others will not heat up even at 40 amps, but they require frequent recharging. When choosing a battery for an electric cigarette, people are wondering about the criteria.
There are five main criteria: energy intensity, rated current indicator, voltage in use, temperature in use, cost. It makes no sense to pay attention to other nuances, like the color of a cigarette. All this is secondary. To choose a good unit, you should study in detail all the criteria. As a result, the buyer will receive all the necessary information for a good purchase.
Energy intensity Electronic Cigarette
Energy intensity expressed in milliamps per hour. Accordingly, the higher this indicator, the better the model will be. Safety depends on the rated current indicator. The conclusion suggests itself that it is desirable to buy batteries with the highest current supply rate. For example, an LG hb6 battery has 30 A, which means it is also suitable for 40 A. But having made such a purchase, a person will prefer a high voltage and sacrifice energy intensity. The energy capacity of the above battery is only 1500 mAh. Therefore, it will hold a charge less than options with 3000 mAh.
Select indicators rated current, which won't overheat the device, but don't sacrifice battery life. It is better to purchase the LG HD2 model, which has an indicator of 25 A and microamps per hour. This will be the average. As for the voltage, you should not focus on this nuance when choosing - if the cigarette has the two previous indicators are good, then the voltage will be sufficient.
Which battery is better for a led flashlight. Tests for charging flashlights.
You also need to choose devices, having a low degree of heating. Overheating an electric cigarette will soon damage the entire mechanism. That is why the battery must be taken one that will work at the lowest temperatures. Price cigarettes approximately the same and this is not the most important criterion. It is advisable to build on indicators first of all.
Top 3 Best Battery Chargers
Nightcore digital charger D4
Charger device can power four batteries. This is a well-established brand, loved by many owners of lithium batteries.
Device equipped with a convenient display - you can study various data, including the speed and time of charging, the voltage on each element. The battery status is very convenient to observe on such a display.
It's universal charger, designed not only for model 18650. D4 should be used by people who have a large number of mobile devices in which several types of batteries are placed.
Beginners will quickly master the work, since charging takes place in an automatic mode.
Efest luc Blu6 oled Bluetooth intelligent Charger
It is also very good model charger devices, designed for 6 batteries. In order to safely charge, a special protection against high current, voltage and so on is installed in the device.
The user gets the opportunity to connect his mobile phone with charging via Bluetooth- You can remotely monitor the battery level. The only drawback of charging is the high price.
Nightcore i2 intelligentcharger
Charger went on sale recently. This is a modern look of the device, equipped with interesting features and improved design.
Users don't have to worry about speed and time charging, because the device determines everything in automatic mode. From a person it is only necessary to install the battery in the right place.
There is only room for two batteries on the device, but the charger is very compact and can be taken with you on a trip.
Li-ion 18650 battery for flashlight
- Li-ion accumulators operate in the range of 4.35 - 4.2 volts. They are often used for the performance of LED lights.
- You need to watch to battery not discharged below established level- 2 volts. In order not to constantly monitor the necessary voltage, you need to use battery for a flashlight with protection. They keep the elements from overcharging or deep rarefaction.
Companies Samsung, Panasonic, LG and Sony do not manufacture such equipment. For this purpose, it is better to purchase a Chinese KEEPPOWER device.
The best 18650 batteries on AliExpress by reviews
- rechargeable battery
- Samsung icr18650
- Rechargeable flat Top Battery
Ideal conditions for batteries- temperature +10 - +25 degrees.
Hi all! Many people have such a flashlight, it is sold in many stores under different names, but its design is the same. It is inexpensive, it shines well, but there is a big drawback - it is powered by two R20 batteries, which are several times more expensive than this flashlight. I want to propose my own way of solving this problem. Instead of batteries, I installed a phone battery in the case and brought out the charging socket. First you need to disassemble the flashlight, remove the rubber cover from the handle and pull out the spring (terminal "-"). She won't be needed anymore.
Next, you need to pick up the battery, it should fit in the flashlight handle. My battery fit perfectly. I attached 2 wires to the battery contacts with electrical tape so that the design was collapsible.
You need to solder the resistance to the LED block, because. our battery produces more than the 3 V required by design. You can calculate the resistance using an online calculator. Such LEDs should be rated for 3V and 20mA.
You can assemble the resulting design.
At the end of the handle I fix the charging socket with glue.
It remains to make a hole in the rubber boot opposite the nest.
Now the flashlight can be used.
Connection diagram.
This improvement allowed to significantly save on batteries. Even if you do not have a battery, then its purchase will pay off immediately, because. its cost is approximately equal to the cost of 2 normal R20 batteries. In addition, the flashlight works on the battery until the last, then it just turns off, while the brightness does not decrease significantly. I used a far from new battery, the flashlight has an operating time of 14 hours.
On inferior 5 mm LEDs for a 18650 lithium battery. Here the scarf was removed, and instead a homemade one was made on new original (the crystal is quite large) 2835 1 W 350 mA LEDs (for monitor backlighting), they have a positive substrate. But you can also use the usual 2835 by changing the polarity to the standard one. On Ali, they cost 3 cents.
When installing a new board, you need to grind the mounting column flush with the reflector cups, the more we grind, the better the focus in the center without dimming is obtained. The charger is used at 5 V 500 mA in narrow cases, it is installed at the top under the battery (down with details), the board with the leads is covered with a thick film - the substrate from the ATX power supply unit and the battery is glued on top of the molecule.
As a driver, an AMC7135 chip is installed at 3.2 V 350 mA, 5 LEDs have 70 mA each, which prevents them from heating up with good light output. It turned out quite solid and durable flashlight, which will now last a very long time.
Flashlight conversion to Li-Ion 18650
Another more modern flashlight with mains charging, the insides are replaced with 18650 batteries and 5V USB charging.
LEDs of 7 pieces were replaced with higher quality 5 mm "hat" type and with a brighter glow. But since the flashlight had two modes, I decided for the future to remake the board for two types of LEDs, 6 pieces of 5 mm in a circle and a central powerful CREE LED or 1 W, it fits on the substrate just right. In this form, diffused light and beam light are obtained.
The driver is standard on the LM358, the current of the central LED is selected within 120 mA, which is quite enough for lighting and practically does not heat the substrate. The heating of the LED substrate will start from 150 mA, but if you use a double-sided fiberglass, you can use the other side as a small radiator, although this is still superfluous, since the luminous flux will only be slightly brighter, but the LED substrate will heat up quite strongly.
Collected, checked, everything clearly came up under the reflector, it shines quite brightly. The light came out cold white from 5mm LEDs and slightly warm white from CREE.
Alteration flashlight A420
Alteration of the lamp "A420" from LDS to LEDs. A friend asked me to look at the flashlight, whether it is possible to make anything sensible out of it, since with an LDS lamp it quickly eats up batteries, and it is a pity to throw it away.
I looked, I thought, the power comes from 4x 1.5 V batteries, you can make a flashlight for 1 - 4 26650 batteries, but this only partially solves the problem, it would be more sense on the LEDs from the flashlight. It was decided to leave the batteries, but convert the flashlight to LED.
Chinese penny LEDs 2835 for 3-3.6 V 60 mA were taken as a light basis, the total current was calculated at 640 mA so as not to overheat the crystal. There is enough light with them, but if you need it brighter, you can put brighter LEDs, and replace the R2 resistor on the driver with a variable one, there will be an additional brightness adjustment.
Has been copied printed circuit board and redesigned for the driver you like on the LM358, racks LED matrix under the contacts, the scarves are taken from old board monitor fit perfectly. A little later, the board was supplemented with a TR4056 charger, the power connector can be installed on the cover, now you can also put any suitable batteries in the flashlight by screwing the terminals directly to the racks.
Alteration of the T-50A flashlight
The canopy of the T-50A model was also redesigned.
After a test for the duration of the flashlight from the built-in battery 26650 5A, after a while the LEDs blinked. I thought it was overheating, but separately from the driver, they shone wonderfully and did not get very hot. The Chinese op-amp LM358, once bought by the party, turned out to be problematic; when replaced with the original, the problem with blinking disappeared.
Discuss the article RECONSTRUCTION OF THE FLASHLIGHT UNDER 18650 BATTERY
lithium batteries, now it's time to put this scheme into action by upgrading a few flashlights. Next, see a couple of applications of memory boards with TP4056 in flashlights:
Batteries taken from old cell phones, found with the same capacities, balanced and soldered into a block. In the first version, 1.5 A, in the second, 1 A. They charge quickly - about 1-3 hours, depending on the current PSU used.
Then I started reworking another old camping flashlight for a 18650 lithium battery, painted a signet under it, came out almost like the original, but smaller. I tried charging, it works. I'll take the whole lantern.
But I completed another old camping flashlight. It is possible to change lenses for different focusing luminous flux. I replaced the acid battery with a 18650 type battery and added a charger on the same TP4056, the capacity of the used battery is 1.3 A:
One more case. They gave me a good case from an ancient flashlight on an incandescent bulb, with recharging from the mains.
The gel battery built into it was long and hopelessly dead. After a little thought, it was decided to build in it a block of parallel lithium batteries 4 pieces of 800 mA each, and expand the functionality by embedding two LEDs at 60 mA and 150 mA into the case.
In place of the removed retractable fork, an additional aluminum plate-radiator was cut out and an smd LED was screwed on for a working current of 150 mA. And in place of the former light bulb, an 8 mm round 60 mA LED was installed.
There was a lot left inside free space, respectively, a ready-made memory was built into the flashlight for again TR4056. The LEDs on the charger board fit perfectly under the hole of the former power LED. Under these charge indication LEDs, a Plexiglas cone indicator was machined and glued into the case. The result was a compact and resource-intensive (3.2 A) flashlight with a recharge from 5 V.
A protective plexiglass was added to the case to protect the LED from dust. And this is a disassembled case, for a more understandable visual acquaintance with the filling of the converted flashlight. There is still an empty space left, it is quite possible to add a step-up converter for recharging a cell phone.
Thus, old electronic structures and devices can be given the opportunity to serve further, using modern electronic base in a new technical quality. And all this will help to do a small cheap chip 4056. With you was Igoran.
Discuss the article CONVERSION OF FLASHLIGHTS TO LITHIUM BATTERIES
In modern times, more and more technology uses lithium-ion batteries as batteries. They do not have a "memory effect", unlike Ni-Cd. They can deliver high current.
I decided to remake two old flashlights for 18650 lithium-ion batteries, since I have a large number of them. Yes, and getting them is not difficult in repair companies that repair laptops.
For alteration, we need a number of components:
- actual flashlights;
- ;
- ;
- plexiglass;
- a piece of thin plastic;
- ;
- wires, hot glue, tools.
Flashlights of a convenient size for installing 18650 batteries in them, in the amount of two pieces. In principle, you can describe the refinement of one flashlight.
I have different charge controller boards. On one Mini-USB, on the second Micro-USB.
These boards can be purchased in China for 15-20 rubles per unit. Also sold in radio stores and radio markets. I have boards without protection (BMS), but we can handle it.
We disassemble the flashlights and take out all of them, except for the switches, LEDs.
Now we take thin plastic, I have ABS from an old battery. It turned out that it is black, but not scary, it will also look great on a blue flashlight.
We cut out the windows so that they fit snugly into the place where the charge plug used to be put forward.
We cut out the required size for the window and holes for the connectors of our charge boards. It is not necessary to glue them, they should fit tightly and I will strengthen them later.
Since our boards do not have discharge protection, battery boards are used in this situation. mobile phone. You can also buy with protection, but I do not have such in stock now. Therefore, I resort to a slightly laborious solution.
We unsolder the wires from our BMS to the batteries. We put the charge controller boards in place and support them. As a spacer, I used segments of a wine cork. We strengthen everything with hot glue, but it is possible without it.
We unsolder the switches, my switches break the plus. There is a board with an LED on the black flashlight. The switch has two on positions, one of which I put on a single LED, and the second position turns on the main LEDs. There is one switch position on the blue flashlight.
We assemble the flashlights and solder the reflectors and proceed to the next step.
The next step is to cut out two records from transparent plastic, I have this plastic from the CD box. We sandpaper until the surface is dull, so the light from the LED is more pleasant.
We glue it to the place where the engine used to be, with which the network plug was extended. You need to glue on one half of the flashlight. Suddenly you will need to disassemble the flashlight.