Normally when the battery goes dead and then recharging it you need to check that the battery has in fact taken on a charge ,
Hook up a voltmeter to the battery and check the voltage . should read 12.6 if the battery is fully charged .
any battery under 12.2 volts needs recharging or replacing .
If the battery is full thern with the voltmeter hooked up to the battery ,try and start but keeping an eye on the voltmeter ,if the voltage drops below 9.6 then battery does not have enough charge to start ..
Now if we have checked and seen that the battery is in fact very good then lets check the immo system .
Close the doors and then lock then unlock the door with your key ,then try and start .
Is the Car icon with a key in it on at all times ,if yes then the key is not getting recognized
and will not let you start the engine .
So how many keys did you have programmed if more than one try another key seen a lot of china made keys fail .
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Kind regards Greg.