Battery pouch, battery cell and method of making a pouch or battery cell

A method of manufacturing a power tool battery, the method comprising:

• providing a pouch having a first sheet and a second sheet;
• sealing the first sheet and the second sheet along at least two walls to define a cell space between said sheets, wherein sealing the first sheet and the second sheet includes sealing at least a first wall portion with a first sealing strength, and sealing at least a second wall portion with a second sealing strength that is less than the first sealing strength such that the second wall portion is configured to fail before the first wall portion;
• disposing a battery cell within the cell space, the battery cell having a terminal tab extending outwardly of the cell space;
• and
• providing an electrical contact located with the second sealing portion and configured to change contact state upon failure of the second sealing portion.

An electrical combination comprising:

• a power tool;
• and
• a pouch-type battery including
• a pouch-type battery case having a joined wall and a cell space within the pouch-type battery case,
• a battery cell within the cell space,
• a terminal tab extending outwardly of the cell space from the battery cell,
• said joined wall comprising at least a first sealing portion having a first sealing strength, and a second sealing portion having a second sealing strength that is less than the first sealing strength such that the second sealing portion is configured to fail before said first sealing portion, and
• an electrical contact located with the second sealing portion and configured to change contact state upon failure of the second sealing portion.