EVERYTHING YOU NEED TO KNOW ABOUT THE 18650 BATTERY

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EVERYTHING YOU NEED TO KNOW ABOUT THE 18650 BATTERY

Message par ivan0 » 03 Déc 2019, 10:08

What is a 18650?
This post tells you everything you need to know about 18650 batteries. An 18650 is a lithium ion rechargeable battery. Their proper name is “18650 cell”. The 18650 cell has voltage of 3.7v and has between 1800mAh and 3500mAh (mili-amp-hours). There are two types; protected and unprotected. We absolutely recommend protected 18650 batteries. The average 18650 battery charge time is about 4 hours. Charge time can vary with amperage and voltage of the charger and the battery type.
Comparing sizes in the picture above the 18650 is 1170 cubic mm, the 14500 and AA are 700 cubic mm, the AAA is 467 cubic mm. Note the 14500’s cannot be used in all AA devices unless they support both 3.7 and 1.5 volt batteries.

Protected vs Unprotected 18650 Batteries?
18650 protected batteries have an electronic circuit. The circuit is embedded in the cell packaging (battery casing) that protects the cell from “over charge”, heat or “over discharge”, over current and short circuit. A 18650 protected battery is safer than an 18650 unprotected battery (less likely to overheat, start on fire).

Unprotected 18650 batteries are cheaper, but we do not recommend their use. Unprotected batteries should only be used where the load/draw and charging is externally monitored and controlled. Properly dispose of any damaged 18650 batteries at a battery recycling center. The protected batteries normally have a “button top”, but check the specs to make sure.

How much power does an 18650 have?
A 3.7v a 3400mAh 18650 stores about 2 aH to max of 3.5 aH. It can store about 10 to 13 watt hours. A small air conditioning unit that can cool about 9000 BTU uses about 1100 watts per hour. So it would take more than 110 of the 18650 batteries to run the air conditioner for 1 hour. In comparison you would need three 12v 40 amp car batteries. But 110 18650s is smaller than 3 car batteries.

How many times can you recharge an 18650 or other battery?
Recharge cycles vary and are limited. Think of it like a bucket. The trick is that the bucket also gets filled with other junk over time, so there is less room. As it is reused, the battery degrades due to oxidation and electro-chemical degradation. This happens to any rechargeable battery such as an 18650, 26650, 14500, AA, AAA or even a car battery. They can only be recharged a limited number of times.

You want to select rechargeable batteries that can be recharged many times. We specifically recommend 18650’s because they have the ability to be recharged 300 to as many as 2000 times.

How frequently should I recharge my 18650?
The way you recharge your battery impacts the life of the battery. If you can measure it, you want to deplete from 3.7v down it to about 3v before you recharge. If you are not sure, use the device until the flashlight or device indicates a battery needs to be replaced. A good charger will tell you the voltage of the battery so you can eventually get a sense of the life of the battery in various devices. If you recharge too frequently you “use up” the life without a return.

Some people don’t let it dip below 3.3v (or even higher). Each brand and model of 18650 has different maximum cycles. So this is really a process of matching your device and usage to the life cycle of the battery. Be aware that an 18650 battery that drops below 2.5v may “lock” the device so it can’t be used (primarily vaping devices).

How do I know my 18650 is dying?
Here is a list of 7 ways you can tell if you need to get rid of an 18650 (or other rechargeable battery). Look through these to determine if your 18560 is nearing the end of its life and needs to be retired:

The battery will lose a charge on the shelf must faster than normal (it loses charge after a couple of days or even worse overnight)
The battery gets hot when charging or discharging (warmer than normal)
You have used the battery frequently over 2 to 3 years.
The battery gets hot when charging or discharging (warmer than normal)
The battery can hold less than 80% of its original capacity
Recharge time gets abnormally long.
If there is ANY cracking or deformation in the battery.
These are the 7 signs your 18650 is dead and it is time to get a new one. If you ignore these warning signs you risk fire or even having the battery explode while being recharged.

How can I measure the quality of an 18650 if I am unsure of the age of a battery?
A trick is to buy one or two similar 18650s and mark them “new” with a Sharpe (or label them A, B, C, etc). Then use them and compare their voltage and discharge rates with the questionable 18650s. Basically you are comparing good vs unknown this way. You can also gauge temperature this way. Charge both the new and unknown one to see how hot the new one is compared to the one you are unsure of.

18650 Features
A battery might say protected mode 3.7v 18650 3000 mAh low self discharge. What does that all mean?

“protected mode” as noted above means it has an overcharge and overdraw circuit protection built in.
“3.7v” – is the optimal or peak voltage. It will drop as you use the battery.
“3000 mAh” measures the amp hours the battery can provide. A higher number is better. The highest realistically availble on an 18650 today is about 4000 mAh, anything higher than that is marketing hype.
“Low self discharge” is a good thing. That means it will hold a charge in storage. The less it loses in storage the more charge will be left for you to run your flashlight or other device.
What are 18650 batteries used for?
Flashlights, electronics, laptops, vaping and even electric vehicles use 18650s. The Tesla uses 7180 of these batteries. Some high lumen flashlights such as the Thrunite TN14 or Fenix PD35 use the 18650. Laptops and other electronic devices use a one or more 18650’s allowing them to be recharged. They are also used in vaping (smoking) devices.

18650s are are generally Lithium Ion batteries. If you are familiar with electronics you can change out some battery packs manually, but be careful though – using the wrong type of 18650 or using it incorrectly can cause a fire.
ivan0
 
Message(s) : 36
Inscription : 13 Avr 2019, 14:02

Re: EVERYTHING YOU NEED TO KNOW ABOUT THE 18650 BATTERY

Message par NinaGood » 04 Déc 2019, 08:07

18650 is supposed to be one of the best batteries on the market, it's quality is really great. But unfortunately it is not compatible with all of the vaping devices, I can use mxjo 3000 only for my vape mods.
NinaGood
 
Message(s) : 42
Inscription : 12 Mars 2019, 13:08


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