EK2 Lithion battery pack,electric batteries for vehicles

Not as powerful as I expected

I bought a cybervelo 8 monthes ago, its battery wasn't as powerful as i expected. As I wanted to go more than 15 miles away (the bike is suposed to help me for more than 50 miles) i bought a new battery expecting it will work better than the one i had with the bike. unfortunately it's exactly the same and i can't go on a ride for the day just for 30 miles. I'm disappointed. To be precise I ride my bike using de second power help , this means that I am actively involved in propelling it forward.