| CPC G01R 31/3835 (2019.01) [G01R 31/371 (2019.01); G01R 31/3646 (2019.01); G01R 31/388 (2019.01); H01M 2010/4278 (2013.01); H01M 10/482 (2013.01); H01M 10/488 (2013.01)] | 20 Claims |

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1. An indicator device for monitoring a state of charge of at least one battery or at least one battery pack, comprising:
control electronics operable to measure a voltage and determine the state of charge of the at least one battery or at least one battery pack; and
at least one indicator for indicating the state of charge of the at least one battery or the at least one battery pack;
wherein the control electronics and the at least one indicator are in electronic communication;
at least one voltage connector configured to be in electric communication with the at least one battery or the at least one battery pack; and
wherein the at least one voltage connector includes between one and four voltage connectors, wherein the between one and four voltage connectors are each in electronic communication with between one and four corresponding sets of control electronics and between one and four corresponding indicators for indicating the state of charge.
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