Don't you have to reinitialise or something in these circumstances? Don't know enough about it but seem to remember reading somewhere it is something to do with pressing the lock unlock fob over and over again until it all starts to work.
@sierrafery will tell you I expect as he has more electrickery brains than me. Also have you tried locking and unlocking the door with the key at least 3 times? Elsewhere I have read says it could be the BCU maybe damaged when playing around with the started motor, did you do any of that? Did you disconnect the battery and then reconnect it properly when recharging it, respecting all the time constraints in the manual. did you recharge it without disconnecting it? All connections to Starter tight?