You might want to inform this guy that when you "duct tape" your battery pack it seems you have something to hide? Like the actual cells that you are buying? Are they prismatic or cylindrical? Do you know the difference? Who makes your cells, and why do you hide them ? Ocean Blue is the logical guess on my part, but that's pure speculation.
For example we sell what we call a "soft pack" which means it has no hard-shell tooling. We do this for many of our automtotive development packs since the specs vary so much from one requirement to another. Attached here is a picture of our 20V/40Ah Soft Pack, which is what I would put this Chinese offering into. As you can see there is no reason to conceal the cells in something as common as Home Depot duct tape - unless there is some element of deception that is intended. People - you have to see what you are buying! No matter how attractive the price is, I would never buy this pack simply because there is no warranty offered, no real specs on the cells, and no proof of what you are getting for your money.
When the e-bike world starts to hold these people responsible for verifying their product, then you will find more companies such as LiFeBATT willing to place products into this market. As long as you continue to support this kind of offering, you will end up feeling like the battery chemistry is faulty and this certainly is not the reality.
Merry Christmas,
Don Harmon