amigo2011 That brown, sticky substance is most likely battery residue or electrolyte leakage, which can happen when a scooter sits unused for a long time. Even if it’s not visibly leaking from the cells, degraded batteries or corroded connectors can cause this and prevent charging. I wouldn’t try charging it again until the battery and wiring are checked or replaced, as it can be unsafe.
This is one reason many parents prefer non-electric scooters for kids, since there’s no battery risk or maintenance—options like this manual kids scooty are much safer and reliable: https://toytanic.pk/product/tricycle-for-kids/
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