The exception is the 9v battery which actually has six smaller ... Inside are an octet of Lithium Ion cells. The majority register 0V, but a few have 0.4V left on them. This is not surprising.

Stardust Power (Nasdaq: SDST), a US battery-grade lithium product developer, has officially broken ground on its $1.2 billion lithium refinery in Oklahoma, which will be one of the largest in the US.

They better withstand cold temperatures. They're readily available as 9v batteries as well as C, D, AA and AAA sizes. A lithium option is more expensive upfront and their shelf life is typically ...