Power tool battery pack

A battery pack, comprising:

• a housing,
• a core pack positioned within the housing, the core pack including
• a cell holder, the cell holder including an upper portion and a lower portion,
• a plurality of battery cells positioned within the cell holder, the plurality of battery cells including a plurality of sets of battery cells,
• a terminal block, the terminal block including a housing and a plurality of battery pack terminals positioned within the terminal block housing,
• a printed circuit board (PCB), the PCB including a plurality of various components attached thereto, the battery pack terminals electrically coupled to the PCB,
• a plurality of battery straps, the battery straps electrically coupling a most positive node or a most negative node of a set of battery cells of the plurality of sets of battery cells to the PCB to provide charging current to the battery cells from a battery pack charger and/or discharging current from the battery cells to a coupled device, the battery straps including a fuse, a first portion and a second portion, the first portion including the fuse and made of a first material, the second portion made of a second material, the second material different than the first material, the first portion of the battery strap electrically and mechanically coupled to the second portion of the battery strap by a weld.