RE:Apple and OrangesYessir, apples and oranges. And if batteries were a fruit, most of us wouldn't know which are apples and which are oranges. That is my point. And here is an example of an article that is consistent with your finding but also goes into more detail showing that the cycle range can be multiple times the general range.
We don't know what we don't know. HPQ newsreleases and videos are not going to tell you the full technical story that the battery players understand and need. Thereby the need for big players to get their hands on the material and do whatever testing they want to do and compare with whatever matters to them. IMO that can explain why industry publications do not seem to be going nuts over HPQ's claim of a world record. Maybe Agoracom can bring in a guest interviewer who can pose the right questions to help us figure things out better.
How long is the cycle life of 18650 lithium battery?Web:www.topbandbattery.com Date:2022-11-08
At present, the cycle life of the 3.7V 18650 lithium ion battery can reach about 500~1000 times, and that of the 3.2V 18650 battery can reach more than 2000 times. Of course, if the battery is a qualified battery produced by a regular manufacturer, it will have a short life if it is a defective or counterfeit battery.
The life of 18650 lithium battery is generally 300~500 charging cycles. Assuming that the power supplied by a complete discharge is Q, if the reduction of power after each charging cycle is not considered, the lithium battery can supply or supplement 300Q-500Q of power in total during its life. From this, we know that if you use 1/2 to charge each time, you can charge 600-1000 times; If you use 1/3 each time, you can charge 900~1500 times. By analogy, if the battery is charged randomly, the number of times is uncertain.
In a word, no matter how you charge, the total amount of power added is 300Q~500Q, which is constant. Therefore, we can also understand that the life of lithium ion battery is related to the total charge capacity of the battery, and is independent of the number of charges. The influence of deep charging and shallow charging on lithium battery life is similar.
The theoretical life of ternary lithium-ion battery is about 800 cycles, which is medium among commercial rechargeable lithium-ion batteries. Lithium iron phosphate is about 2000 times, while lithium titanate is said to reach 10000 cycles. At present, the mainstream battery manufacturers promise to produce ternary cells more than 500 times in their specifications. However, after the cells are assembled into battery packs, due to the consistency problem, it is important that the voltage and internal resistance cannot be exactly the same, and their cycle life is about 400 times.