Contributed commentary by Michele Windsor, Global Marketing Manager, Ultralife Corp.

The 9 V battery was originally invented for transistor radios in the 1950s and, at the time, it was actually expected to deliver 22.5 V. As the power demands of transistor radios came down, so did the power output of the battery, until its size and power was eventually standardized into the 1604 international ANSI standards. Read more about Three Times You Need the Right 9 Volt Battery …