Do not worry. GreatEbike team is in full operations even during the Corona Virus crisis in EU.
Replace - by replacing old cells with new ones - you will get a new battery in its original packaging . The range will be up to 90% , depending on the new capacity you have selected. We only use branded Panasonic and Samsung branded products for powering electrics. The guarantee for defects of repairs is 24 months . The batteries listed here are only examples, we can repair any model and battery type for the electric wheel. more information here