Which 18650 lithium battery or polymer lithium battery is more durable?

Under the same volume of 18650 lithium battery and polymer lithium battery, lithium polymer battery has a higher energy ratio; if you calculate that the cycle life of a polymer battery is less than 80% of the battery capacity, it is about 350 cycles, about 18650 The battery is the same. For stability, polymer batteries are safe and will not explode. If the 18650 battery is not manufactured correctly, the possibility of an accident is very small. 1. The 18650 battery is cylindrical with liquid inside. Due to the design and material of the battery, 18650 is suitable for high current. 2. The advantage of polymer lithium battery is its small size and large capacity. The disadvantage is that their life span is shorter than 18650 years. 18650 has two kinds of lithium battery voltage, rated voltage 3.2V and other materials, lithium iron phosphate ternary rated voltage 3.7V to 12V assembled lithium battery, if it is the 4 series of lithium iron phosphate material, it is the cathode and anode connection of the battery In the next section, there are four, in the first quarter that is actively used as the positive electrode of the battery, and the fourth section is the cathode as the cathode of the battery pack. The voltage range is 8-14.4v; except for the missing section, the three materials are similar. The voltage range is 9-12.6v. The above two voltage ranges are calculated by adding a protection board. Regarding the lithium battery pack, one more thing to note is that the lithium battery itself cannot be overcharged. Related protections such as over-discharge and short-circuit, so a protection board must be added. If the lithium battery does not match the capacity, it cannot be connected in series. Otherwise, a battery with a small capacity will be charged in advance, and a battery with a large capacity will not be enough. After several cycles, the battery voltage difference is getting bigger and bigger, and finally the whole group of batteries is scrapped. In fact, you don't want so many batteries, and the power of the router is only 6w. When the capacity of an 18650 battery is about 9w, you use two 18650s in parallel (do not match the capacity in parallel, it will automatically balance the current), and then add a dc-dc converter circuit to increase the voltage to 12v, ok. The use of two parallel 18650 batteries brings great convenience to charging, as long as you directly purchase a ready-made lithium battery protection board, and then directly connect to the dc5v power supply, no other measures are required. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Could lithium batteries be replaced by graphene technology?