The difference between the D15i and D15 Pro is in terms of the battery pack; while the former gets a single lithium-ion battery, the latter gets an additional VRLA (lead-acid battery).
I am using it for a month now, so I can say that I made the best decision to buy bgauss b8. It takes 3 hours to be fully charged when it's completely drained. The riding is super smooth. It gives a range of around 70-75 in first mode p.S first mode speed limit is 25kmph
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