Such modified devices were involved in 30 fires in the first half of this year. SINGAPORE: For riders of active mobility devices (AMDs), going faster or lasting longer on a single charge is impossible – unless they resort to illegal and dangerous modifications. “It's cheaper than buying a new bike. It's cheaper than buying official parts,” said a home-based mechanic who declined to be named. These parts – such as batteries and motors – can be ordered from e-commerce platforms like AliExpress or