Wah you've lost me Khurramriaz!!!
All you do for the maps is the following!
There is a page on this site for Garmin Maps
Download them (gmapsupp.img) and then using the keygen GMK1.5 (link found above this page) ... make sure you create the SW.UNL and GMAPSUPP.UNL file (make sure you put in the MAP ID) at the same time and then put the map and all *.UNL files into the Garmin folder on your phone or SD Card (wherever you have installed Garmin too)
Anyways as for Battery Life being killed by the new Garmin 5.0 software; I can confirm this on my Samsung Innov8 phone
When I install Garmin to my phone memory (8GB) and exit the software properly (and no mike2111 it isnt still running just incase you ask, this can be checked by holding the menu button to see current running applications) my battery like is around 1 day with moderate usage; such as only phone and sms.
When I install the Garmin XT 5.0 to my SD Card and DONT insert the card my phone lasts for a few days (under moderate use)
When I insert my SD card and not run Garmin XT software, my phone only lasts for about 1 day (under moderate use)