See below pictures of my experiments. The total voltage is up to 5V arranged in 6 cells conected in serial between them and more 6 cells in paralel, a total of 12 cells.

The real size of these cells are 1cm x 1cm x 1.5cm.

Each cell can generates up to 0.6V supplied with salt water only!

More than 3 volts as shown in multimeter.

Each cell can generates up to 0.6V supplieds with salt water only. No any toxic chemical is used for construction of them.

It can turns on easily a circuit with chip integrated!

It's a LED in blue color of 0.48 W