Should a gallbladder be removed if it contains 80% stones and i have no symtoms?

No ... but ...: Be sure that you really have no symptoms. Most people with gallbladder disease have very vague symptoms at first, usually after eating fatty foods, with vague upper abdominal "discomfort" which people pass off as "indigestion." if you have associated belching, bloating, nausea, feel that "if you could just pass gas or belch you would feel better" -- you may be having symptoms of gallstones.

Depends: Gallstones without any symptoms is not usually a reason for removing the gallbladder, but there are some exceptions. If you are a high risk for anesthesia it may make sense to have surgery when you are healthy so as to avoid the risk of a severe gallbladder attack (which may occur). Discuss with a general surgeon.

Try dissolving them!: Gallbladders are useful and many have chronic digestive issues after removal. A prescription drug, Ursodiol, can help dissolve but even more effective is Golden Coin Grass, a Chinese herb, and Chanca Piedra from the Amazonian rainforest. See an integrative practitioner for guidance and see http://tinyurl.com/3ff7yqf http://www.rain-tree.com/chanca.htm#.WRgxdjLMw1g and http://tinyurl.com/l3nga6g

Possibly: Sounds likely with that degree of gallstones, check things out with your GI doctor or GI surgeon to find what the professional does to determine if you need your gall bladder out...