Yeah my EBL charger is great. I don't have issues like that. Howcome you've persevered for so long without asking for a replacement from Amazon? I'd have been in touch right away if it wasn't working as intended. You do have a right to something that works properly so definitely get a new one sorted asap.
I think I have done maybe 3 or 4 charging sessions, the batteries do last a while once charged, I charge 4 at a time, with 8 total its one charge per 4 cycles, and I also used it wired for a long time as well. Sometimes you dont know if its just a bad product or a fault as well, so its a case of not been bothered enough to exchange it I suppose.