What do the letters in front of the numbers mean for 3.7V batteries?

Question

Batteries

I dismantled 4 electronic cigarettes from different manufacturers. And I found that in each of them a 3.7V battery is installed, while in 3x it is a 17350 model, and in 4x it is 18350.
However, even 3 cells with the same marking 17350 showed absolutely different capacity. Moreover, the number of puffs actually produced before the discharge of the batteries is very different, as much as 2 times. The question is, what do the letters in front of the numbers of the standard sizes of these batteries mean?
For example, the battery + SYM17350 - turned out to be the weakest and ended in about 6 hours of continuous vaping.
Element MJ04 17350 - showed a result of 7-7.5 hours.
Element LZ 17350 7.5-8h.
And for 12% more physical volume, the TRB18350 element showed 12 hours.
The difference in volumes was calculated by the formula =
3.14*(18/2)^2*35 / 3.14*(17/2)^2*35 = 1.12
Pi*R^2 * cylinder height.
Nevertheless, the capacity in milliamp hours, depended not only on physical dimensions, so I wonder what these letters mean?

PS: the Internet is full of articles about batteries, but nothing about disposable batteries ...

Answer 1

The letters are just some kind of model number that the manufacturer came up with.
17350 is size 17 - diameter. 35 - length. 0 - round shape.
And all together - the unique name of your particular instance. Sometimes capacitance is added to the letters and size.
The capacitance depends on the technologies that the manufacturer used.

PS: the Internet is full of articles about batteries, but nothing about disposable batteries ...

Judging by the markings and voltage, you have completely reusable li-ion batteries)

I dismantled 4 electronic cigarettes from different manufacturers.

Just because a device is disposable doesn't make all of its components disposable.