yes sounds like the battery isn't being charged. From the initial start on you were running on the battery and when you got gas the battery was already drained......
that has happened to me before ! but not on the Ninja.
check your fuzes and battery !
you probably lost the voltage regulator.... or just a fuze....we could hope right ?
.... good luck Cali !!!!
i'm rooting fer ya ! you can do it !
.....
Bob..........