If you root go for :
- Wakelock Detector (find out exactly what caused the drain: screen / cpu)
- Greenify (hibernate apps regularly)
- ROM Toolbox Pro (disable startup and other related intents)
Since I did (I stayed on stock) : I don't have to worry about charging during the day + all lag is gone (even with 500 apps and >100 more frozen).
History: Samsung I9505, Samsung Note I, Samsung Galaxy, Nexus One, TynTN II (Kaiser), SPV C550 (Hurricane), SPV C100
[Other : Wii U, NDS]
Lurker since 2007 ...