18650 Phone Battery –mAh and Safety Analysis

APR 03, 2020   Pageview:107

18650 is the classification of the size of lithium ion batteries. The name indicates that the battery is 18 mm wide and 65 mm high and zero indicates a cylinder. All cylindrical lithium-ion batteries use the same name. Other common sizes are 16340, 14500, 17620 and 10440. 18650 batteries are generally rated at 3.6-3.7 volts. For most batteries, they are fully discharged at 2.5 volts and fully charged at 4.2 volts.

Are 18650 lithium batteries the Best Batteries for Cellphone?

Some 18650 lithium ion batteries can store more than 4,500 milliamps or supply up to 30 amps. It's all right, but maybe who do you think it matters? How does it affect me?

You may not know, but you probably already have a lot of 18650 batteries. It's probably on your laptop battery, it's in the garage inside the power tool batteries and it's in your USB power bank, to charge the phone while traveling. They are also used in some of the best and brightest lenses on the market. There are probably hundreds of them on electric road vehicles and people who are really interested in using it to upgrade their evaporator, but are these batteries used to power cell phones?


Battery is one of the most essential components of a cellphone or a tablet. Cellphones these days come with different types of batteries and it depends on their quality that determines how much energy they can keep and how long the device can be operated with a single charge. There are also restrictions on weight and size as a battery of large size would make the device heavy and bulky, making it uncomfortable option. So, basically there are three parameters of battery that designers focus on and these include chemical composition, weight and size.

24V Emergency Starting Power Supply,Low Temperature Large Current
Low Temperature Large Current 24V Emergency Starting Power Supply Battery specification: 25.2V28Ah (lithium battery) , 27V300F (supercapacitor pack) Charging temperature:-40℃~+50℃ Discharging temperature: -40℃~+50℃ Starting current: 3000A

There are two types of lithium ion batteries used in cellphones Lithium Polymer and Lithium Ion. Lithium-ion batteries are used in mobile phones because they have energy capacity. But since 18650 lithium battery cell is of cylindrical shape like a thick cell so they’re not suitable for cell phones. 18650 cells are a good fit lengthwise, and also voltage and energy density wise but again since they’re quite thick so overall they can’t be a good fit to cellphone.

What is the highest mAh 18650 Battery?

When choosing an 18650 battery for your device, the first two things to consider are the battery brand and the capacity, which describes how many milliamps can be drawn from the battery for how many hours and is expressed in milliamp-hours (mAh). For brands, you find the one that is truthful in their ratings.

The lop level manufacturers of 18650 batteries are Panasonic, LG, Sanyo, Samsung and Sony. They make long lasting lithium batteries of a standard size 18mm by 65mm which can be in all 18650 compatible devices. These are the major brands that you can rely on to provide consistent, high-quality and truthfully rated batteries. These manufacturers are well-known and have long standing tradition, standard and values to uphold.

LG 18650 batteries are known to have the highest capacity that is equal to about 3500 mAh. The LG’s new MJ1 model is the one that has its normal capacity highest of all 18650 batteries in the market.  Panasonic NCR18650B battery cell has the second highest capacity of 3400 mAh. Panasonic manufacture these high capacity lithium ion battery cells to be used in laptop computers and environmental friendly energy technologies. They boosted the battery capacity by improving the electrode material because they’re widely used in laptops. Samsung’s 30Q 18650 battery is another high power 3000 mAh battery cell developed by Samsung. The Samsung 18650 30Q battery is an efficient, stable and commonly found in power tools, power bank and many other industrial electronics. Another 18650 battery having the highest capacity is Sanyo’s NCR18650GA battery with the capacity equal to 3500mAh. This is also an excellent battery cell for building power banks, BMS’s, battery packs and for using in high performance Flashlights also. So, these were the 18650 batteries that have the highest capacity (mAh).


Are 18650 Phone Batteries Safe?

Since 18650 batteries are very powerful, so you must be aware of the safe handling of them because under some circumstances it can be very dangerous and devastating. There are basically two types of 18650 batteries –protected lithium ion 18650 batteries and unprotected lithium ion 18650 battery.

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Low Temperature High Energy Density Rugged Laptop Polymer Battery Battery specification: 11.1V 7800mAh -40℃ 0.2C discharge capacity ≥80% Dustproof, resistance to dropping, anti - corrosion, anti - electromagnetic interference

Protected 18650 batteries have a small electronic circuit embedded into the cell packaging. This circuit secures the battery against various dangers such as short circuit/over current, overcharge and over discharge and temperature. So they are quite safer to use in your devices.

On the other side, unprotected 18650 lithium ion batteries don’t have the electronic circuit integrated into the cell packaging. This is why they can have more current and capacity compared to a protected 18650 battery. So, there's always a danger of short circuiting, over heating or over discharging.

Now, we’re gonna talk about some key factors on 18650 battery safety. This is very important to make sure that your 18650 lithium ion battery wraps has no tears or there’s any wet spot underneath the wrap itself and you need to make sure there’s no positive and negative contacts, if there is you need to get rid of this battery but make sure you don’t throw it in the garbage you need to take precautions. Use the same standards, if you find any rust in your battery as well, you want to get rid of that battery and don’t use it inside to any of your devices anymore.

In other words, you just need to make sure there’s no deformation. If you stick to this, it’ll make sure that there are no devastating after-effects. Another point is to keep these cells away from water you don’t want your batteries getting close to water or getting immersed inside water it’s very dangerous, when lithium and water meet they go boom, and it really can be dramatic.

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