Batteries

48 30

Work out the energy density you need first to see if it's possible with todays technology. If that's ok...

Try stacking NiMH cells on end. Hope this asci art works..

oooooo ooooo ooo oo

NiMH cells are also flat and can be stacked. They can also be wired in parallel series combinations unlike NiMH.

no.

45 circles can make a triangle with 9 on each side

if ypu can get some NIMH cells done in 3.33cm diameter 3cm long cylinders

40 of them would be 48V and fill your space fairly well.

Bye. Jasen