my phone is sony ericsson, the charger is not workin anymore, so i started to use my dads charger...and when you charge the mobile they say (optimised charging) but now it started to say (charging alien battery) i got freaked out....loool.....do you why is it sayin like this?

Ask your Dad to buy you a new charger. There may a compatability issue and your battery may be at risk.

hey !!you didn't say what phone your dad is using if it's not the same model with your phone then that's the problem.
just get a new original Sony ericsson charger.

which phone model you and your dad have?
make sure the charger has 5.0-5.5V output (I have a charging cable drawing power from centralized USB charger, actually it's USB hub with power adaptor)

he probably is using a generic charger

alert!
some generic charger don't work
got one from local store, it can't charge (no reaction)
when I measure the output voltage, it's too high (5.8V)
the funny thing is: when I switch the plug with OEM Samsung charger, it works!