Piaggio Sfera 50 E-Starter just clicks

Hello to each other, I have had my first scooter (Piaggion Sfera 50 BJ 94) since June and was very satisfied so far, but 4 weeks ago the V-belt was torn and until I repaired it, the scooter stood 3 weeks, it was cold, but in the underground garage. When I repaired the V-belt it started and it was all good, I drove 300 meters, turned it off and when I hit it on and drove a few meters, he assumed on his own, sob The E-starter went then, but the scooter didn’t go on and after 2-3 attempts the E-starter stopped working and it only makes a click at the starter relay. With the kickstarter I get the scooter, but it goes off again. I tried to start the E-starter and knock on starter and starter relays with a hammer, but it did not do anything. Battery is from May 2018 and has charged it completely, with which everything is in Order. I suspect now that the starter relay can be broken?! unfortunately have no multimeter to measure where the problem is. Does anyone have experience and a tip for me? Especially related to the above described that the scooter first ran and then went out and then after a few attempts of the e-starters did not run at once. It is my first scooter and I give my best when screwing, so forgive me if I overlook any clear things or not recognition. With best regards