18650 won’t charge? SOLVED – Check it now!

It’s a common issue that 18650 won’t charge. This might be a lack of chemicals inside the battery as well as a thermal trip which prevents the battery from charging. This article discusses all possible factors and how to resolve the same.

Batteries have been a basic necessity of power and energy for a long time now. Since the invention of electricity, batteries have accepted a principal work for various purposes and each and every industry has used the centrality and versatility of batteries by one way or another or another or the other. Talking about batteries, the most broadly perceived among them is the lithium-ion and the alkaline battery, which has found its usage in various purposes and electronic articles. In this article, we will look at some of the most common problems with a 18650 battery most crucial being a 18650 won’t charge.

What is 18650?

A 18650A 18650 is a lithium-ion fuelled battery. Their industry name is “18650 cell”. The 18650 cell has a voltage of 3.7v and has someplace in the scope of 1800mAh and 3500 milliamp hours. There are two varieties to it; the protected as well as the unprotected ones. The ordinary 18650 battery charge time is around 4 hours and the general charging time can alter for amperage and voltage of the charger and the battery type.

Issues with a 18650 battery

Charging Issues

It has often been seen that most of the 18650 Lithium-ion batteries do not tend to charge. Such a scenario is quite common and it occurs mostly because of a lack of chemicals inside the battery as well as a thermal trip which prevents the battery from charging and connected to a charger circuit. Although there are possibilities that the problem lies with the charger itself, yet, it is very useful to check the internal conditions of the battery if your 18650 doesn’t charge.

Hence, in this consideration, the following are some of the steps which you can undertake if your 18650 lithium-ion battery won’t charge:

Step 1:

Initially, you will need to measure the terminal voltage of the battery with the help of a voltmeter or a multimeter.

Step 2:

If you notice that there is some amount of voltage remaining on the battery, you will need to connect it in parallel connection with a charged battery of the same ratings.

Step 3:

Now, you must be able to see that there is some positive change in the terminal voltage of the battery. However, if the terminal voltage does not increase, you will have to keep on repeating the charging process.

Step 4:

And Repeat Until The Battery Starts Charging.

Step 5:

If you find out in the first step that the terminal voltage of the battery is exactly zero, this means that the battery has completely discharged and the overheating trip has been activated.

Step 6:

This essentially implies that the internal membrane of the overheating protection trip has come into contact with the surface of the battery due to the internal pressure which has been developed inside the casing of the battery.

Step 7:

After fixing the membrane, you must notice that the battery will start to show a terminal voltage once you test it with a multimeter.


By far most of 18650 batteries are housed in a steel case, and batteries with low quality, because of their absence of assurance, can make their inner weight all of a sudden increment when cheated for and detonate when they surpass the satisfactory worth.

Issues, for example, cut off, temperature, or twisting or even cut off the battery may make the battery detonate. In ordinary use, the 18650 batteries that get blast are commonly mediocre batteries. The security of customary lithium-particle batteries is very great. The fundamental explanation that can make the lithium battery detonate is that the battery with low quality is inclined to the inner short out during use.

At the point when an interior short out happens, it will produce high temperature and high-pressure gas in a brief timeframe, which is past the point where it is possible to be discharged through the fumes valve. A blast will happen.

Following 30 years of advancement, the 18650 battery readiness process has been extremely experienced, notwithstanding the exhibition has been incredibly improved, its security is additionally exceptionally great. So as to maintain a strategic distance from the blast of the fixed metal fenced-in area, the 18650 battery is currently furnished with a wellbeing valve at the top.

The pressure release valve is standard for each 18650 battery and is the most significant blast security hindrance. At the point when the inside weight of the battery is excessively high, the top relief valve will open the fumes decompression to keep away from the blast.

Be that as it may, when the security valve is opened, concoction substances spilled into the battery will respond with oxygen noticeable all around under high-temperature conditions, and there is as yet the plausibility of fire.