Logitech 3.7V Li-ion Rechargeable 930mAh Battery - White (190304-2000)
Battery Charger for Logitech Harmony 880 plus Extra Lithium Ion Battery | eBay
foone🏳️⚧️ on Twitter: "but if I pull out the battery and measure it with my multimeter, it says very clearly that it has 3.7volts https://t.co/pTOGvaKC3M" / Twitter
Logitech Harmony One Battery (Blue Label) For Remote - Bulk : Amazon.ca: Electronics