You need a multimeter..
The facts..new battery..short charge cleaned switch.. no difference..
took battery out three day charge, refitted battery..worked fine..
First some battery tenders just do a trickle charge at a few hundred milliamps, this is fine to keep a good WELL CHARGED battery in top condition, but when you buy a new battery it should be initially charged with a charger capable of at least 4 amps..
Second when you removed the battery from the circuit you stopped any small drain that poor connections or anti theft devices might produce..
Third if the charging system on the bike is faulty the ride out could have put enough drain on the battery to make it unable to restart.
Fully charge the battery again and then see if it starts, if it does you have some tests to do..
Beauty is only skin deep but ugly goes right to the bone.