SALT WATER BATTERY .E.g: U can use it 2 power clocks.Materials::-l non-metallic cup.:-l salt, h20, vinegar & bleach.:-l A variety of metal strips:Al & Cu:-l Alligator clips leads. :-l LCD clock.:-l A voltmeter. INSTRUCTION::-o Fill d cup about 3/4 full of h20. Ad about a teasp. of salt about a teasp. of vinegar & a few drops of bleach.Into dis solution put strips of Cu & Al. Clip d metals 2 d top of d cup wth d alligator clips,bt don't let d clips 2 tch d liquid.U nw 've a simple battery.