Amazon.com: Cameron Sino This Battery fits Logitech Harmony 950 915-000260 Elite 915-000257 Replacement and Spare and is Compatible with Logitech 533-000128 623158 : Electronics
Logitech Harmony One Advanced Remote Control Battery Li-Ion 3.7V (950 mAh) Battery - Replacement For R-IG7 and Monster MCC - Battery World
Logitech Harmony Elite review: Touchscreen remote gives you total control, for a steep price - CNET