What causes Battery capacity degradation over time on the Niu Mqi+ Sport?

Test full charge range vs claimed spec on ride Estimated fix cost: $300-$600

What causes Brake lever and caliper wear on the Niu Mqi+ Sport?

Squeeze both levers, check pad thickness and alignment Estimated fix cost: $30-$80

Check NiuApp for fault history and error logs Estimated fix cost: $150-$400

Inspect tread depth, sidewall cracks, and valve seal Estimated fix cost: $40-$90

Known issues to inspect before buying a used Niu Mqi+ Sport. What to check and how much repairs cost.

SERIOUS

Test full charge range vs claimed spec on ride

Fix cost: $300-$600

MODERATE

Squeeze both levers, check pad thickness and alignment

Fix cost: $30-$80

SERIOUS

Check NiuApp for fault history and error logs

Fix cost: $150-$400

MINOR

Inspect tread depth, sidewall cracks, and valve seal

Fix cost: $40-$90

☐Request NiuApp battery cycle count data

☐Test ride uphill to check motor power

☐Inspect frame for crash damage or welds

☐Verify charger included and port undamaged

Decent if battery is healthy and maintained