Yes I have 2 chargers, but it doesn't matter which one I use.
If it lights up for a couple of blinks on the charger does that mean the battery is OK?
Just gonna throw this out there. When I first set my sister up to vape I sent her to an online store (discountvapers) to get what she needed. She purchased battery, charging cable, wall wart and various other parts. Battery was charged when she got it so she vaped it until it needed to be charged. She attached it to the charger cable and the cable to the wall wart. Plugged it in, it blinked a couple of times and then nothing. We contacted DV. He sent us another battery and I returned the defective one back to him. The second battery did the exact same thing so back to Eric at DV. At this point I am questioning the charger cable or the wall wart but am assured that a bad cable or wall wart is unlikely. Sis used and then went to charge the 3rd battery. A loud pop smoke and tiny flames ensued from the wall wart. Sis got the bejesus scared out of her but problem finally found. Eric replaced battery, cable and wall wart and no more problems.
All this to say that cables and/or wall warts can sometimes be where the problem lies. Back when I was using ego style batteries it seems the batteries fire button light would blink a few times when first plugged in and then settle into a steady burning light. when fully charged the light would go off. Before giving up on your new batteries I think I would invest in a new cable and wall wart from a reputable vendor.
I have had a couple of batteries purchased from fasttech that were bad from the get go or shortly thereafter so it is possible that your ego batteries set on the shelf to long and the charge on them went to low thus ruining them but it seems strange that you bought 4 and they all do the same thing.