Best Battery replacement option?

[Released: 1985] One of the most unusual features of the Sega Master System is its dual media inputs: one cartridge slot and one card slot. The card slot accepted small cards about the size of a credit card.

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/markiiisystem
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Best Battery replacement option?

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Looking to replace the battery in my Childhood Ultima 4 cart before i attempt another attempt. Whats the go-to battery in 2022?

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