Turns out it's not so easy to replace a ps2 battery. : r/ps2
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Have you changed the battery in your PS2? : r/ps2
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Probably the most convenient place for the clock battery : r/ps2
Sony PS2 handheld mod looks downright gorgeous, just needs a battery pack (video) | Engadget
PS Vita Release: Vita Battery Fixer 3.0 - Wololo.net
PlayStation 2 Slimline Clock Battery Replacement - iFixit Repair Guide
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