But this is
my real life usage, I'm just not into heavy gaming
Would've had around 5% more if I didn't get a random reboot at around 75% mark.
Activities include: email & whatsapp sync, around 10 mins phonecalls & 20 texts, reading ebook, browsing web & market, playing light game.
What makes a difference is good signal reception (all green/not using 3G unless there's no wifi and I need to download a file) and constant access to wifi (working from home, didn't need to go anywhere the last two days). Setting screen brightness on lowest unless I really need to turn it up helps too.
On heavier days when I'm out and about, using GPS navigation and mobile data, making more phonecalls & texts, taking pics, I typically get about half of that (20-24 hours).
LG Optimus L9 P765 | JB 4.1.2 V20H
Samsung Google Nexus S I9023 | JB 4.1.2 | Paranoid Android 2.55 | Marmite 7 | 1000/100 MHz ondemand/cfq & ICS 4.0.4 | CyberGR-MOD v12 | Air v4.2 | 1000/100 MHz lazy/deadline
LG-P500 Optimus One | GB 2.3.7 | CyanogenMod 7.1.0 mik_os v6.5.8 | goldenleaf v.111226-LG | 729/480 MHz smartass/sio