377 battery uses silver oxide as the cathode and zinc as the anode. Since they use alkaline electrolytes like sodium hydroxide (NaOH) or potassium hydroxide
High Capacity 2-50pcs SR626SW AG4 Equivalent 377S 377 LR626 1.55V Button Cell Battery for Watch Candle lamp Replacement - AliExpress
High Capacity 2-50pcs SR626SW AG4 Equivalent 377S 377 LR626 1.55V Button Cell Battery for Watch Candle lamp Replacement - AliExpress