I have a used folding e bike that I purchased online on Offer-up and it has no marking as to the make and model so that I can purchase a replacement battery. I got a lot of use out it and got my money worth and don't want to sink a lot of money into it to replace it. I'm willing to buy a replacement on-line(e-bay, amazon) that has the specs that I can verify( down discharge, size and dimensions). It's worth a $100 to $150 gamble for me because even used it ran strong and long. Any info or advice that is out there I'm open and eager for it! Thanks and Pleze reply!