How to replace the battery of a rechargeable flashlight?

Introduction How to replace the battery of a rechargeable flashlight? Can be replaced with 18650 lithium battery. Many rechargeable flashlights have broken batteries but all other parts are intact, so it would be a shame to throw them away. When purchasing batteries o

How to replace the battery of a rechargeable flashlight?

Can be replaced with 18650 lithium battery.

Many rechargeable flashlight batteries are broken, but other parts are intact, so it is a shame to throw them away. It is difficult to find batteries of the same model, and the lifespan is very short and expensive. It is a good idea to replace it with a 18650 lithium battery. This battery has a diameter of 18 mm, a length of 65 mm, a capacity of 4800 mAh, a rated voltage of 3.7 volts and a full charge of 4.2 volts. The battery and accompanying charger are inexpensive. However, implementing the replacement requires certain practical skills. The steps are as follows:

1. Remove the original charging fork, charging plate and battery. Keep only the lamp holder, switch, flashlight housing and the connecting wire to the lamp holder switch.

2. Make a circular holeat the end of the flashlight to insert the battery.

3. Attach a piece of metal 70mm from the new opening as the positive electrode of the new battery and firmly solder the positive lead of the original battery.

4. Make a battery back cover, install a spring, and connect the negative lead of the original battery as the negative lead of the new battery. Secure with screws or other means. But it should be convenient to remove the battery and charge it.

Once this battery is fully charged, it can provide continuous lighting for more than 60 hours.

My high brightness flashlight uses three AA batteries. Can I replace it directly with an 18650 battery?

Lithium batteries can be used directly to power and charge flashlights, but it is not recommended to use lithium batteries in this way. The bat usage platformLithium teries is relatively high, so protection is especially important when you do this. When you want to use them, when lithium batteries power the flashlight, it is recommended to add a dedicated circuit board for small lithium batteries to protect the charging and discharging of the flashlight, to maximize the efficiency of lithium batteries.

Use 4 1.5 batteries at the same time. Can I replace the 3.7 volt battery with four rechargeable lithium batteries? The flashlight is 10 W.

Yes. Generally, it is AA or AA size batteries, the voltage is 1.5V, the voltage of 3-cell batteries is 4.5V, and the working voltage of 3W LED is generally of about 3.6 V, so generally, a flashlight with ? 3-cell AA size batteries must also use a circuit. To reduce the voltage, the lithium battery voltage is about 3.6V,which is slightly higher when fully charged, so using a circuit to stabilize the voltage is more conducive to protecting the LED. Of course, direct driving is also possible, but if the quality of the battery is not very good or if the battery is fully charged, when the voltage is too high, it is not beneficial for the life of the LED.

I make titanium lighting for flashlights. Current flashlights with relatively strong lighting effect are mainly C10 flashlights equipped with 800 lumens single-chip CREE? They have good long distance focusing and excellent road lighting effect. It is the first choice for outdoor and night riding. There is also a small 18650 LED equipped with T6 LED?, which is small in size and super bright, and can be used for communication.

A flashlight that usese four 1.5 volt batteries cannot be replaced with four 3.7 volt rechargeable lithium batteries, because the voltage of 1.5 V batteries in series is only 6 V. The voltage of four batteries The 3.7V lithium battery in series reaches about 16V (because the 3.7V rechargeable battery is fully charged at about 4.2V), which will burn out the flashlight.

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