Peugeot Jetforce 50cc TSDI

[Wohloz]

Hi All, new to posting need some advice please with above scooter
I am struggling to get the petrol injection to fire consistently, I noticed that sometime the bike would start and other times not,I disconnected the injector from the body of the engine then cranked it over , no jet of fuel , the battery was starting to get flat So I tried another battery that I had when I connected the other battery up a jet of fuel squirted out of the injector I thought okay let’s try the other battery again when I tried the other battery again no fuel squirt superseded to connect the old one again and again I had another fuel squirt so I charge the battery up overnight reconnected it today and there is no feel squirt again even with both batteries could it be an ECU problem or something to do with the voltage of the battery it is the genuine battery that come with the bike