Polarity reversed?

[Noyl Wendor]

I have two of these
http://www.thecustomsabershop.com/Tr...pack-P517.aspx
The came with my GCS Ascend, and a charger to charge them up. One of the batteries makes the light blink red when charging. I looked it up and that seems to be the case.
However, the exact same happens when both are placed in the charger. I'm 100% certain I've not ever put them in backwards. Lastly when I place them in the charger (charger not plugged into wall socket) both the lights on the charger are green.
I don't remember anything like that with previous chargers. Is there another way polarity on a battery could get reversed? Or maybe just bad PCBs?

[Forgetful Jedi Knight]

I have two of these
http://www.thecustomsabershop.com/Tr...pack-P517.aspx
The came with my GCS Ascend, and a charger to charge them up. One of the batteries makes the light blink red when charging. I looked it up and that seems to be the case.
However, the exact same happens when both are placed in the charger. I'm 100% certain I've not ever put them in backwards. Lastly when I place them in the charger (charger not plugged into wall socket) both the lights on the charger are green.
I don't remember anything like that with previous chargers. Is there another way polarity on a battery could get reversed? Or maybe just bad PCBs?

Probably a PCB went bad.