weltatec Quality Battery Battery Accu universal remote Logitech compatible with Logitech Harmony One Universal Remote Control - High Capacity Battery Li-ion battery replacement battery Universal remote control battery - (only original weltatec with Hologram) (Electronics)
Fits very well in your Harmony One. The battery was half full and keeps for days. But he does not charge, there is no acoustic signal when placed on the charging unit. Too bad.