System and methods for regulating charging rate based on environmental conditions

A method for regulating a charging rate of a battery module for an autonomous underwater vehicle, the method comprising:

• measuring a first battery cell temperature using a first temperature sensor located at a first battery cell of a plurality of battery cells in a battery module;
• determining whether the first battery cell temperature corresponds to a lowest temperature of the plurality of battery cells;
• in response to determining that the first battery cell temperature corresponds to the lowest temperature of the plurality of battery cells, determining a first charging rate corresponding to the first battery cell temperature;
• determining a first charging current and a first charging voltage corresponding to the first charging rate;
• and
• adjusting a charging voltage to the determined first charging voltage and adjusting a charging current to the determined first charging current for the battery module.