US 12,003,125 B2
Tool circuitry for series-type connected battery packs
Alex Huber, Menomonee Falls, WI (US); and Timothy R. Obermann, Waukesha, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Jan. 4, 2022, as Appl. No. 17/568,285.
Application 17/568,285 is a division of application No. 16/387,786, filed on Apr. 18, 2019, granted, now 11,218,009.
Claims priority of provisional application 62/659,555, filed on Apr. 18, 2018.
Prior Publication US 2022/0131397 A1, Apr. 28, 2022
Int. Cl. H02J 7/00 (2006.01); H01M 10/42 (2006.01)
CPC H02J 7/0025 (2020.01) [H01M 10/425 (2013.01); H02J 7/0063 (2013.01); H01M 2010/4271 (2013.01); H01M 2220/30 (2013.01); H02J 7/0013 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrical device comprising:
a first battery pack receptacle configured to receive a first battery pack;
a second battery pack receptacle configured to receive a second battery pack, the second battery pack electrically connected in a series-type configuration with the first battery pack; and
bypass circuitry, the bypass circuitry configured to
bypass the second battery pack receptacle when the second battery pack is not present in the second battery pack receptacle,
wherein the electrical device is configured to be received by a third battery pack receptacle included in a housing of a power tool, and
wherein the electrical device is configured to remain operable to allow use of the power tool while bypassing the second battery pack receptacle.