Abstract: A battery monitoring device includes a probe for insertion into a valve of a lead acid battery. The probe includes an electrolyte monitoring probe connected to an electrolyte level sensor, and a temperature probe connected to a temperature sensor. The battery monitoring device also includes a display for communicating the temperature and electrolyte level of the lead acid battery, and an LED for indicating that the electrolyte level is low. At appropriate intervals, the battery monitoring device can deliver pulses of electricity to the lead acid battery and counteract sulfation, in order to enhance battery performance and extend the useful lifetime of the battery.