Alright, for those who have the
ACER A500 WIFI ONLY TAB you know that there is no PHONE on the TAB... So read on if you are interested in prolonging your battery life... jejeje
THIS HAS BEEN REPORTED TO PROLONG YOUR BATTERY LIFE ALMOST 12 EXTRA HOURS... I'M STILL TESTING... Working GREAT so far... Here are my current findings...
BEFORE CHANGING/DELETING FILES...
IDLE - 2mA
PEAK - 151mA (During stress test that ran at least 6 minutes)
AFTER DELETING/CHANGING FILE NAMES...
IDLE - 1-2mA
PEAK - 104mA (During stress test that ran at least 8 minutes)
You need
ROOT to do this (See my post on how to ROOT the tab... jejeje)and must have a
ROOT enabled file browser to make the changes...
1.) Find/Locate the directory
/system/app and find the
PHONE.APK and the
TELEPHONY.APK
You can either rename the files (e.g. PHONE.OLD and TELEPHONY.OLD) or even DELETE the files.
DONT FORGET TO MAKE A BACKUP OF YOUR FILES
BEFORE DOING ANYTHING!!!
***IF YOU NEED TO FACTORY RESET YOU WILL HAVE TO REPLACE/RESTORE THESE FILES OR YOU WILL BE STUCK AT THE START SCREEN!!! 
I am not responsible if you brick your device!!! ***
For those that do not follow advice and deleted the files before making a backup, I have attached both files on this thread...
