According to Garmin, the new solar Instinct boasts up to 24 days in smartwatch mode while worn indoors, and more than 50 days with sufficient solar exposure. I haven’t had my solar Instinct long enough to test this, but in theory, its battery life is unlimited if your watch gets enough sunshine while in Battery Saver mode.
Garmin Instinct® Solar Outdoor Solar Powered Smartwatch
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Garmin Instinct® Solar Outdoor Solar Powered Smartwatch
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