Both modes fail suddenly in use
Power cycle bike. Check battery connection. Inspect controller wiring closely. Escalate for controller/battery fault resolution.
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Some bearings feel gritty or fail soon after use—often only inner bearings are bad
Turn axle by hand with wheels off ground. If grinding/sticking felt, remove axle and visually inspect all four bearings. Replace damaged ones. ENVO can provide warranty bearings as needed.ENVO E50/E35 Scooters Quickguide
.Flats soon after use or trouble removing/installing tube
Inspect for rim strip misalignment or tire bead issues. Use proper tire lever technique; if tube seems defective out of box, contact ENVO with photos for replacement.Not clear how or when to use extra battery connections
Request step-by-step from ENVO; generally, use only one battery port at a time unless system designed for parallel charging.ENVO D35/ST Quickguide
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