Still eats too much battery even in sleep mode, from fully charged to 86% overnight, R1 with the same setup takes 2-3% max. Oh well, back to R1, I don't notice any other differencies anyway.
With R2 and R3 huge battery drain. 3G, WLAN, BT all off.
Just doing nothing, and battery is empty after two days.
With R1 battery lasts for 7-10 days!!!