1. A system comprising: a battery pack comprising a plurality of subdivisions; a measurement system configured to determine a plurality of subdivision electrical parameters, each subdivision electrical parameter of the plurality of subdivision electrical parameters being associated with one of the plurality of subdivisions; a battery control system communicatively coupled to the measurement system, the battery control system configured to identify a subdivision satisfying a criterion based on one or more first calculated derivative ratios, the one or more first calculated derivative ratios comprising derivative ratios of a subdivision electrical parameter associated with one subdivision of the plurality of subdivisions relative to a subdivision electrical parameter associated with another subdivision of the plurality of subdivisions.