How are letters of the alphabet are used as a labeling system ( AAA, AA, A, C and D) in a battery?

I cant find info on this[ i went to wikipedia.org but i dont understand it]. I would greatly appreciate if u explain it to me or give me websites.

Under Forum

2 Comments for How are letters of the alphabet are used as a labeling system ( AAA, AA, A, C and D) in a battery?

1. Gene | February 15th, 2011 at 7:59 am

It’s actually quite simple and it goes back to battery powered vacuum tubes. A batteries were used to light the filament (glowing) part; C batteries powered the control grid (input) and the B battery was for the plate (output). The names stuck and when they made smaller a batteries, the called them AA and AAA.
2. tlbs101 | February 15th, 2011 at 8:01 am

Except for ‘A’, those are the standard designators used today for the vast majority of 1.5 volt batteries (or 1.2 volt for NiCads and NiMHs)

There are also N batteries that are the size of AA batteries but about 1/2 the length.

In the “old” days, there were also B batteries of different voltages (like 45 , 60, and 90 volts). These were used for old portable tube radios before transistors were widely used. A batteries (single ‘A’) were also used in portable tube circuits for tube-filament power.

.