Know more about 18650 Rechargeable Battery Before Buying
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By Kim | 10 November 2022 | 0 Comments

Know more about 18650 Rechargeable Battery Before Buying

18650 lithium battery is one of the lithium-ion batteries, with excellent capacity and adaptability to a variety of scenarios and become one of the favorite products now. The 18650 lithium battery on the market is mixed, according to the differences in pricing and sales positioning of the brand model, so we also need to combine the specific circumstances of a comprehensive screening of the most appropriate one. Today, we introduce the information from the user's point of view, including the definition of 18650 lithium batteries, and types of difference.

A. 18650 lithium battery introduction

18650 is the originator of lithium-ion battery - Japan SONY company in order to save costs and set a standard lithium-ion battery model, where 18 means the diameter of 18mm, 65 means the length of 65mm, 0 means the cylindrical battery. Common 18650 battery is divided into lithium-ion batteries, lithium iron phosphate batteries. Lithium-ion battery voltage is 3.6V and 4.2V, lithium iron phosphate battery voltage is 3.2V, and common capacity is 2200mAh-3600mAh.

Lithium batteries (Li-ion, Lithium Ion Battery): lithium-ion batteries have the advantages of lightweight, high capacity and no memory effect, and thus are commonly used - many digital devices use lithium-ion batteries for power, although their prices are relatively expensive. The energy density of lithium-ion batteries is very high, and its capacity is 1.5 to 2 times that of NiMH batteries of the same weight, and has a very low self-discharge rate. In addition, lithium-ion batteries have almost no "memory effect" and do not contain toxic substances and other advantages is also an important reason for its widespread use. In addition, please note that lithium batteries are generally marked with English 4.2V lithiumion battery (lithium battery) or 4.2V lithium secondary battery (lithium secondary battery), 4.2V lithiumion rechargeable battery (rechargeable lithium battery), so users in the purchase of batteries Be sure to look at the signs on the exterior of the battery block to prevent the cadmium-nickel, hydrogen-nickel batteries mistaken for lithium batteries because they do not see the battery type.

B. 18650 lithium battery type difference

Lithium batteries marked 3.7V or 4.2V are the same. 3.7V refers to the platform voltage (i.e., typical voltage) during the use of the battery discharge, while 4.2 volts refers to the voltage when charging a full charge. The common rechargeable 18650 lithium battery, the voltage is marked 3.6 or 3.7v, 4.2v when fully charged, which has little to do with the power (capacity), 18650 battery mainstream capacity from 1800mAh to 2600mAh, (18650 power battery capacity is mostly in 2200 ~ 3600mAh).

It is generally believed that the no-load voltage of the lithium battery to 3.0V or less is considered to be used up (the specific value needs to see the threshold value of the battery protection plate, for example, as low as 2.8V, there are also 3.2V). Most lithium batteries can not be discharged to the no-load voltage below 3.2V, otherwise excessive discharge will damage the battery (generally on the market lithium batteries are basically used with a protection plate, so excessive discharge will also lead to the protection plate can not detect the battery, thus unable to charge the battery). 4.2V is the maximum limit of battery charging voltage, generally considered to be charged to 4.2V no-load voltage of lithium batteries are considered electric Full, the battery charging process, the battery voltage in 3.7V gradually rise to 4.2V, lithium battery charging can not be charged to 4.2V or more no-load voltage, otherwise it will damage the battery, which is the special place of lithium batteries.

By appearance, 18650 battery has 2 different types, button top battery and flat top battery. 
Apart from the appearance, there is no difference in function. Button top and flat top is designed by each manufacturer according to their own assembly needs, battery safety, battery capacity and other factors, in fact, there is no essential difference.

Refer to the following picture.

But a 3.7V 18650 battery for flashlights and a 3.7V 18650 battery for vapes/ laptops are not the same battery. 3.7V 18650 battery for vapes/ laptops is a high-discharge battery. Usually, discharge current in the market is 10A/15A/20A/30A/40A/60A. The li-ion battery for flashlights' discharge current is about 1A-2A, It's the most difference between power lithium battery and ordinary battery.

18650 lithium battery according to the different brands and models can be divided into a number of products under the plate, they also have certain differences in pricing, light weight, high capacity, no memory effect and other advantages make 18650 lithium battery can play an extremely important role in many occasions, which also makes the market began to flood with many inferior products, as consumers do not have the relevant professional background knowledge. How to correctly screen out the most suitable machine is very important. These are some of the contents that must be understood before buying.

Garberiel is a professional outdoor gear manufacturer for flashlights, headlamps, rechargeable batteries and the like. Our store sales 18650 chargeable batteries, 26650 rechargeable batteries, 14500/  AA rechargeable batteries, CR123A/ 16340/ 123a rechargeable/ unrechargeable batteries, 1.2V rechargeable aa batteries, CR2 rechargeable battery. Please visit our battery store for more information.

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