Anything under 1.7ohms has the potential to damage a mass-produced fat battery. And one member said cold weather can increase the chance of that happening due to temperature differences in the parts.
Also - with big batteries, never screw anything in further than needed to conenct and work, including the charger. And ALWAYS wipe the end of your battery including down in the valley around the battery center post every time before you put one on a charger. Otherwise juice film builds up and will prevent proper connection.
And I recommend trying a different vendor and a new charging cable. I also recommend using a USB to AC with 5v and at least 500mA per USB port with your charging cable, not a PC.