Im going to let you in on a littpe secret.
The big batteries.
They arent big batteries.
They are literally multiple batteries in a trench coat.
If you open up a high V battery you will actually find connected 6V or 12V batteries inside.
Thats why the numbers are all multiples of 6
And even 6V batteries are made of smaller 1.5V batteries.
[Look at this](https://www.reddit.com/r/mildlyinteresting/comments/rnlfbn/this_12v_battery_is_made_up_of_eight_15v_button/)
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