水すい銀ぎん電でん池ち

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Meanings

1

noun

mercury cell; mercury battery

A small primary battery using mercury oxide as the cathode; now largely phased out due to environmental concerns.

water

銀silver

電electricity

池pond, cistern, pool

乾かん電でん池ち
乾電池 is a general term for dry cell batteries, while 水銀電池 specifically refers to mercury cells.
ボタン電でん池ち
ボタン電池 refers to button cells in general, which may include mercury, silver oxide, or alkaline types; 水銀電池 is a specific type of button cell.

Compound of 水銀 (mercury) and 電池 (battery), directly describing its chemical composition.