*This part replaces obsolete part #: and 794247-00.
This part is compatible with the following machines:
What tool is needed to unscrew the screws on the battery pack?
The tool you will need to unscrew the screws that hold the 90508011 battery pack, is called a Torx Wrench, they come different number sizes. The 330019-13 is a size T-20. Torx wrenches can be found in any hardware store.