Described herein are system for evaluating operation of a battery by utilizing battery operating data for the battery and utilizing battery operating data for a plurality of other batteries. A system for evaluating operation of a first battery based on measured temperature and voltage monitored in the first battery and in a plurality of other batteries, the system comprising: a battery monitor circuit and a remote device in communicative connection with the battery monitor circuit, wherein the battery monitor circuit wirelessly transmits temperature and voltage information for the first battery to the remote device, wherein the remote device receives temperature and voltage information associated with a plurality of other batteries, and the remote device is configured to evaluate a condition of the first battery as a function of both: (i) the temperature and voltage information of the first battery and (ii) the temperature and voltage information of the plurality of other batteries.