have you tried this step out?the phone has been on wall charger for 3 1/2 Days .. still no red led!
Battery was on 86% when the phone was bad flashed, remember we are talking about XPERIA Z wit a new battery, how much time do you think i have to wait guys?
Thnx!
http://forum.xda-developers.com/showthread.php?t=2364338
this is a trick only for xperia Z