Mileage 7.8Ah 20-40km(Pure Electric Mode) 40-60km(Moped System), Maximum Speed 25KM/H, Input Voltage 100 – 240V, System Voltage 36V, Model D3S Shifting Version, Battery Lion battery, Gradeability 30 degree, Power Assist System 3 gear power boost, Battery 7.8Ah, Max Load 120kg, Brand FIIDO, Recharge Time 5hours.
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Aliexpress
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Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. Uhm… There’s no price history (in my database) for this product right now.
Link: Banggood product page
1. ($589.99): BGFDD3SCZ
2. ($589.99): BGD3SMS
3. ($594.99): D3S2021
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGFDD3SEU, PICODICOM, issamFDD3SEU, BGFDD3SEU19, BGFDD3SEU11, BGFDD3SEUB5, BGFDD3SEUXM, bGpAnDacHeCk, 7bcdf9, EUBGFDD3S78, ISSAMEUFDD3S78, BG9AD3S, BGFDD3SBDS, BGEBSC15
(there’s a little possibility that old coupon will work)
Price history and price alert
There is only one database record (it was for $589.99), so you can’t see price history chart.
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).