Is it better to have a higher capacity for 18650 batteries?

Is it better to have a higher capacity for 18650 batteries?

Lithium battery packs of different models (especially different volumes) have higher capacity and longer service life. Setting aside factors such as volume and weight, of course, the higher the capacity, the better.

But for the same battery model, the nominal capacity (such as 600mAh) is also the same, but the actual measured initial capacity is different: for example, one is 660mAh and the other is 605mAh. So, is 660mAh better than 605mAh.

The actual situation may be that the high capacity is due to the addition of things that increase the initial capacity in the electrode material, while reducing the things used for electrode stability. The result is that after dozens of cycles of use, high-capacity lithium batteries quickly deplete their capacity, while low capacity lithium batteries remain strong. Many domestic battery manufacturers often use this method to obtain high-capacity batteries. However, after six months of use, the standby time for users is extremely poor.

The civilian AA nickel hydrogen batteries (also known as No. 5 batteries) are usually 1400mAh, but there are also standard high-capacity ones (1600mAh), and the same principle applies.

The cost of increasing capacity is sacrificing cycle life. Manufacturers cannot truly 'increase' battery capacity without focusing on modifying battery materials.