Protective covers and cases for handheld electronic devices, namely, cell phones, portable media players, tablets, personal digital assistants, e-book readers, and computers; protective covers and cases for computers; battery management systems consisting of batteries, firmware, and hardware in protective cases that house and electrically connect to electronic devices, namely, cell phones, portable media players, tablets, personal digital assistants, e-book readers, and computers, wherein the battery management systems manage, monitor, and extend battery lives of the electronic devices housed in the protective cases