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Hello, thanks for posting
Are you using the same key that always started it before? Disconnecting the battery will not stop the factory engine immobilizer from working?
Does it have an aftermarket security/alarm system installed
Was the no start condition the reason for cleaning the battery terminals?
Sounds like something electrical is disconnected, please check the mass air flow sensor connector or possibly a fuse blew during the battery cleaning, do all dash lights turn on with the key?
Do you have a 12 volt DC testlight or a voltmeter?
OK, the air intake hose was disconnected from the throttle body, Oh well, I was close with the MAF sensor, very good, have a nice weekend.