Sadahiro....I've done nothing....I've always wondered if there were hardware variants that caused the battery issues. I've never had them even stock. I got scared right after I got the phone and bought the extended battery thinking I was going to have issues. As far as use...I mean I think I use my phone, but do I use it as much as you or the other having battery issues...not sure. Its the phone I get all my work calls on, texting, two email accounts, craigs list notifications, weather, etc. The only thing I really don't do a lot of on my phone is WIFI. My kids grab it from me to play robodefense. I feel like my battery life has improved over stock with these ROMs.