Originally Posted by Julius

I would advise you to make sure the connections between the cells are flexible. Especially between the top mounted cell and te one below it.

During crashes the top cell has a tendency to move (also slightly due vibration) and you will experience problems if the connection is rigid.

Before I switched to the Xceed lipo pack I used a long wire (about 5cm or 2 inches to connect the top cell to the rest of the pack and laid it in the recess between the cells.