I would check the battery manufacturer's specs before using a 977. Many companies state on their packaging not to use any MRC charger. MRC uses a different algorithm in their chargers that can (and have) damaged lipos.

I have personally owned a 977. Great NiMH charger...but buy something else for lipo. Just my .02

PS I just checked AMain and they have removed lipo as a capability of the 977.

http://www.amainhobbies.com/product_...rger-NiCD-NiMH