22 Years' Battery Customization
Dec 21, 2019 Pageview：7774
The 18500 lithium battery has special requirements for the working environment. In general, the 18500 lithium battery cannot be over-charged, over-discharged, over-heated, over-charged or discharged. Otherwise, combustion, explosion and other phenomena will easily occur.
The 18500 lithium battery has the protective board, which can control the lithium battery to work in the specified environment without explosion and combustion; At the same time, check the overvoltage, under-voltage, overcurrent, short circuit and over-temperature status of each single battery in the battery pack for protection so as to extend the service life of the battery. Without protective board, lithium batteries are prone to explosion, combustion and other phenomena.
We can distinguish the difference between battery with protective board and without protective board by the appearance of 18500 lithium battery:
Flat top 18500 lithium battery: no protective board
Button top 18500 lithium battery: with protective board, because the top of the protective board is protruding. The protruding part is protective board.
Top brands of 18500 lithium battery: Samsung, Panasonic, Sony, LG, AW, Efest, MXJO, etc.
Sanyo, which has been acquired by Panasonic, is power battery while Panasonic is capacity battery.
The characteristic of SONY battery is that the continuous output is large, especially for its VTC series. The maximum continuous output is 30A or above, and the internal resistance is relatively low.
South Korea Samsung and LG have more complete variety, good cost performance, but don’t have special feature. As for the import of this cell, as long as it is not required to discharge especially high rate, whether the capacity, or the discharge rate, it is generally very popular in mid-market.
| cell model | Panasonic NCR18500A | Efest IMR18500 | AWT IMR18500 | MXJO 18500 |
| nominal capacity（mAh） | 2040 | 1100 | 1400 | 1000 |
| nominal voltage（V） | 4.2V | 3.7V | 3.7 | 3.7 |
| maximum weight（g） | 33.5 | 32.7 | 33.8 | 33.1 |
| diameter（mm） | 18.15 | 18.1 | 18.2 | 18.11 |
| height（mm） | 49.36 | 50.93 | 49.1 | 49.94 |
| shape | flat top | flat top | flat top | flat top |
| with protection or not | no | no | no | no |
Common 18500 lithium battery model
Battery brands: Panasonic, Samsung, LG, SONY, MXJO and other brands produce 18500 batteries. The circumstances of each manufacturer are different, and you can choose according to your own electrical equipment. The following is the performance of several brands of 18500 batteries:
High-end + capacity type: Panasonic (Sanyo)
High + medium power discharge: Sanyo
High-end + high power discharge or above 30a: SONY
Middle end + capacity type or mid - power discharge: Samsung or LG
Middle end + high rate discharge or above 30a: SONY
Purchase channels: to purchase authentic 18500 lithium batteries, you need to go through formal channels, such as Walmart, Amazon, Alibaba and other platforms.
Model and application: the 18500 battery has different types due to different materials, and its voltage and capacity will vary to some extent. Therefore, we should choose the right battery according to the field we want to use in.
Environment temperature issue: as for the usage of rechargeable batteries, people often ignore the influence of environment temperature on the battery life. Under the high temperature or low temperature environment, the battery self-discharge rate will be much higher, especially the high temperature will greatly reduce the service life of battery, so before buying, you need to communicate with engineers on the working equipment or environment, so that you can buy the right battery.
Protective board issue: 18500 batteries without protective board will have the risks of deformation, leakage and explosion. In a vicious race of prices, companies sought cheaper protective boards, or do not use this board, leaving the market flooded with lithium-ion batteries that may explode. Consumers cannot distinguish from the appearance of the protective board, so you’d better choosing a reputable merchant.
LED flashlight commonly used lithium battery models are: 18500, 18650 and 26650 lithium battery. 26650 battery flashlight can be compatible with 18650 battery, but the 18650 battery flashlight cannot use 26650 battery.
Cell model：ICR18500 3.7V lithium ion battery
Nominal voltage：3.7V
Storage voltage: 3.7-3.9V
Charge cut-off voltage: 4.2V
Discharge cut-off voltage: 3.0V
Nominal capacity：1400mAh
Product dimension: 18×50±1mm
Whether have protection: yes
Top: flat top
Maximum constant charge current: 1400mA（1C）
Maximum constant discharge current: 2800mA（2C）
Material: lithium ion battery ICR
Charging cycle: over 500 cycles
Most of the batteries used in e-cigarettes are external lithium batteries. Some e-cigarettes have built-in lithium batteries or RC battery. There are several types of external e-cigarette lithium battery: 18350, 18500, 18650, 26650. The definition of the model is: take 18500 for example, that is cylindrical lithium battery with 18mm battery diameter and 50mm length .
Model：IMR 18500
Nominal voltage：3.7V
Nominal capacity: 900mAh
Minimum capacity: 900mAh
Length: 49.9mm
Diameter: 18.21mm
Weight: 45g
Top: flat top
Whether have protection: no
Maximum constant discharge current: 15A）
Maximum constant charge current: 2.15A
Cycling life: 300 times
Battery WH: 125 WH / Kg
Charge cut-off voltage: 3.0V
The 18500 battery holder is molded from UL 94v-0 grade plastic. The contact shall be made of 0.012"(0.30 mm) thick spring steel and shall be coated with tin-nickel or gold-plated phosphor bronze, which is designed to withstand a variety of serious improper operations and recharge times of 18500 lithium-ion batteries. Those 3.7V high-energy lightweight mobile electronics, industrial and telecommunications applications can use protective circuits to prevent battery damage. The battery socket adopts the bite type PC contact, which can ensure the stability during wave soldering.
Features of 18500 battery holder:
Through-hole and surface mounting configuration
Bite type PC contact is fixed reliably, and is suitable for wave soldering (THM)
Tin-plated nickel contact ensures excellent welding performance (THM)
Gold-plated contact ensures superior welding performance (SMT)
Polarity mark is clear and easy for orientation
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