I have had orion plats for about a year now. I charge them at 4.0 amps although the 1C rule means that I could charge at 4.8Amps.

I had one that I charged in January. I pulled it out in May, topped it and the Ice said it was already full. I ran it, AND IT WAS FULL.
the charge stayed in it for 4 months and had little/no noticable degradation.