Otello 125 – Battery/Lathe/Standgas Problems

Hello! My scooter, bought 1 year ago at about 4,500 km, had a falling battery power after about half a year. I then replaced the battery with one with more power, but also this has never helped the scooter to full power when starting or in the stand gas. Some questions: I filled the battery with the acid packs, but I filled in only one of two “packs” and then used the battery. The scooter could not start with it, it was hardly Stro In the end I had to recharge the battery every four weeks, because otherwise there was not enough power left to start. Does it destroy the battery if you start the battery with only one acid pack, as happened with me, even if it is later replenished? Today I tested the battery / alternator. The battery is not the same as the battery, despite the charging on the charger. Then I replenished the second pack, after which the scooter could start, but with little power. The values are worrying. With the engine switched off I have about 11.4 volts. Directly when starting it drops to just under 6 volts, only to plug in at idle then to about 11.3 volts. If I lightly gas, it drops to 10.5 volts and rises with increased speed dan to about 12.3 volts. If I let go of the gas, the scooter dies off at about 11.7 volts. However, it does not always die off, if I let it go without giving it gas in idle, it usually stays on. However, e so that I have to rotate properly on the gas train before the tires turn at all, i.e. the speed is in the basement. So what could be defective? Incidentally, the tacho needle does not work. Although the driven rod is still measured (digital), but the tacho needle hardly moves upwards, remains hanging at below 20km/h. Besides, it looks bent?! Has it perhaps bent in the heat? Can I only replace the tacho needle? A visit to the workshop with this problem costs 500 euros.