What is Eco-Drive?
Eco-Drive is a type of solar-powered watch manufactured by Citizen Watch Co., Ltd. These watches are equipped with a rechargeable lithium-ion battery (typically referred to as a capacitor), which is charged by an amorphous silicon solar panel located under the dial. Due to the rechargeable nature of the capacitor, the watches are advertised as never needing a battery.
Like all analog watches however, they do require regular maintenance. Eco-Drive users in particular are advised to be mindful where they service their watch. In many cases, unqualified service depots mistakenly install standard silver-oxide batteries into Eco-Drive movements, causing significant damage to the circuit and other internal components.