PaperVolt batteries - pack of 4, shipping included

Voltage 3 volts Keep in mind that like most batteries, the voltage will drop gradually over the life of the battery. Capacity 25 mah 25 milliamp hours could typically power a red LED at medium brightness for 12 hours.  Dimensions 26mm x 29mm Just a smidge over an inch square Thickness .45mm That's less than 1/2 millimeter! Add a little magic to your projects with paper thin power! You can connect Papervolt batteries to your circuit using conductive tape (or alligator clips if you're old school). These batteries are less than half a millimeter thick (.45mm to be exact). That's thin enough to embed in a greeting card without incurring extra postage. They are designed to be laminated inside smart credit cards--yes, they can survive hot lamination. Magical indeed! At 26mm x 29mm, these little batteries are just a smidge over an inch square, small enough and flexible enough to hide in any number of projects, from a light-up Teddy Bear t-shirt to a flashy duct tape brace