How to choose the top 18650 batteries in China?

How to choose the top 18650 batteries in China?

How to quickly find the most suitable battery among numerous 18650 battery brands that claim to have high power and energy density!

The cathode materials of 18650 batteries include 80% nickel rich or above, NCA, 811, LFP, etc., while the negative electrode materials include graphite, graphite/silicon oxide composite materials, hard carbon, etc. The capacity ranges from 2000 to 3500. Most companies have already implemented charging and discharging technologies from half 0.5C (Chg) to 3C (Dch). However, truly excellent battery manufacturers not only have high capacity, but can also achieve C-rates above 3C, such as 5C, 7C, and even 10C. These batteries are usually divided into two categories: high energy density (usually above 3000mAh) and high power density (2000 to 2600mAh), with 2600 to 3000mAh batteries possessing both characteristics.

Measure the battery temperature using a 1C-5C or 7C charging and discharging program (the maximum discharge capacity claimed by the company), while using a temperature control system or a simple thermometer to measure the battery temperature. Batteries with temperatures above 60 degrees Celsius, especially during discharge (close to or below 3V or lower), are usually of low quality.