In 1834, the German invented a simple motor; In 1859, the French invented the lead-acid battery; In 1870, Belgium invented the DC generator; Finally in 1881, the French combined the DC motor and lead-acid battery and made the world’s first

What should we do if our electrical bicycle can¡¯t be charged? First, turn on the?electric lock,?then check?whether the?charging port?have voltage.?If it doesn¡¯t have, the battery may probably has something wrong. The internal non-recoverable failure must be sent to the original