celtboy

hi guys..my A4 2001 1.9tdi..well i had a new jvc stereo fitted a few months back..good stereo..but since then i have had a power failure problem..i never linked it to the radio..as when the car is turned off the radio dies also..but i have replace( well local mechanic has) the battery twice..but i am now getting the same thing..the battery will charge up on jump..and is holding the charge..but it takes a few weeks to drain..now the mechanic says there is now lights on in boot etc..but still i have this problem...the stereo has a usb drive which i leave plugged in at all times..???

it was fitted bt the 'halfords' guys..local car accessories here in ireland..he seemed to know what he was at..but maybe he made a boo boo?? any ideas??

tnx