Its a simple homemade battery costs around .92$
Step 1: Materials
500g of ordinary chlorax bleach
×1 clip cable
×10 50ml small container's
×10 aluminum strips
×10 copper strips
Step 2: Cells Construction
Take a knife , make two slits , beware make one small and make one bit large and make a small hole using shouldering iron for drain hole.
Step 3: Electrodes
Fit the aluminium strip to the large slit and copper to small slit.
ALUMINUM - cathode
COPPER + anode
Step 4: Filling Electrolyte
Take one container, fill water until it reaches top, later add a spoon of chloride bleach, stirred it well until it dissolve.
Step 5: Testing Cell
Have a look, each cell produces around 1.35v to 1.45v.
Step 6: Connecting All Cells
Now, I have connected all cells together, it produces 14.30v to around 15v max so I can easily connect to my home theater.