Lithium Cell
Lithium Coin Cells are small discs that are very small and very light, great for small, low-power devices. They're also fairly safe, have a long shelf life and fairly inexpensive per unit. It operates at 3 volts, one Li-MnO2 can replace two alkaline or silver-oxide cells, which function at 1.5 volts.
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 CR1220 |  CR1616 |  CR1620 |  CR1632 |  CR2016 |
 CR2025 |  CR2032 |  CR2430 |  CR2450 | |