42 Volt 2.0 Amp Li-Ion Battery Charger with 8 mm Coaxial Connector SunL SL150-12B and this is the upgrade

and this is the upgrade will almost give you a new bike

Check if the batteries are connected properly

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This 12V YTX12-BS replacement dry charged Scooter & Motorcycle Battery 180 Cold Cranking Amps (CCA)

42 Volt 2.0 Amp Li-Ion Battery Charger with 8 mm Coaxial Connector SunL SL150-12B and this is the upgradeOptimized for use with Lithium ion batteries, the charger uses a plug in coaxial connector with an 8 mm outside diameter and a 5 mm inside diameter and provides an output of 2. 0 amps. The coaxial connector is sometimes referred to as "barrel plug" due to its cylindrical shape. For the longer life of your charger, please handle it carefully and store in a safe, dry location when not in use. As electric scooters are predominantly used outdoors, many