TOM WALKER wrote in a message to ROY J. TELLASON:

RJT>I remember seeing projects in the old Popular Electronics that used a 90V
RJT>battery,  most notably the original "nonsense box" (a set of astable
RJT>oscillators using neon bulbs) that the original author potted in
RJT>clear acry
RJT> I also remember "9V" batteries in other than the original size, all
RJT>rectangular but some significantly larger than the "standard"
RJT>size.  And th
RJT>there were all those other voltages,  22.5,  45,  and 67.5 as
RJT>well.  I *thi
RJT>I saw mention of a 135V battery once.

RJT>I'm gonna have to do some digging,  see what info I can come up with.

 TW>  I nmy digging I fould that ALL of those voltages are Stil
 TW> lavaiable. As  well as a 500 VDC battery that is used in some
 TW> Professional Photo  Strobe units designed for rappid firing.

Oh really?  That's a bit of a surprise to me,  as I haven't seen any of
those sizes in quite a long time... 

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