[theducks]

Originally Posted by Quoth

I mistyped. UK Flag = USA #6.
Need new glasses.
My source:
http://www.blaukatz.com/tables/basic-round-cells/

There was a much smaller cell with thread on the case designed to heat a wire hot enough to light the gas stove/fire/lamp
U14 109.5mm tall 51.2 dia, threaded top
Attachment 202313
Attachment 202314

An old #6 Flag
Two of these would run your ereader for a long time

Attachment 202316

Old hand crank (Magneto) Telephones used to have a couple of those in the case. Many rural locations did not have regular power in the early days and the phone needed local 'Talk Battery' help on longer lines.