hii
i am charging my new lipo 2200mah for last 90 Minuit by 850ma charger its still showing red led but the battery is still cool by touching. is it charging or not
 

850x90min=1275mah
So depends on how low the battery was to start with. Usually supplied with 50% charge.
Do you have a cell checker?
If each cell is close to 4.20, it's fully charged.

Btw, if a Lipo is hot under charging at slow rate, it's already too late!
Welcome to RCI.

i suggest you buy a smart charger like a IMAX B6 charger its a good investment!

Normal charge rate is 1C. Ie 2.2A for a 2200mah lipo. Will take 30-45 mins as the lipo is usually not discharged more than 50-75%. The charge rate slows as the battery gets full.
Under usual circumstances 2 hours on an 850mah charger should be enough for a 2200mah lipo.
Best of luck.