I am having a problem with my Prodeco Mariner folding 20" ebike, purchased used about 5 years ago. I think these bikes were made in 2013, 2014. I let it sit too long, so the battery was dead, would not charge. I watched videos and bought a Jesverty DC Power Supply Variable, 0-60V 0-5A Adjustable Switching DC Bench Power Supply on Amazon, which actually woke the battery up. But as soon as you put a load on it, it cuts out now. So I watched more videos on how to balance 18650 cells and how to cut power to the BM to revive it. So I opened it up and this is what I found. Pouches. Don't quite know what to do now.