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Amazon.com: Synergy Digital Remote Control Battery, Compatible with Logitech Harmony One Remote Control, (Li-Ion, 3.7V, 950 mAh) Ultra High Capacity Battery : Electronics
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Logitech Harmony One Remote Battery Replacement - YouTube
Kastar Replacement Battery Pack for Logitech Harmony 900 Remote Harmony One | eBay
2x Pack - Logitech Harmony One Battery - Replacement for Logitech Universal Remote R-IG7 Battery (950mAh, 3.7V, Lithium-Ion) - Walmart.com
Logitech Replacement Harmony One Remote Battery Door Cover