Battery management system (BMS) forms a crucial system
component in various applications like electric vehicles
(EV), hybrid electric vehicles (HEV), uninterrupted power
supplies (UPS), telecommunications and so on. The
accuracy of these systems has always been a point of
discussion as they generally give an error of maximum
10% considering all the parameters together. In this paper a
system is presented which is developed using low cost
microcontrollers for measurement of electrolyte
temperature, electrolyte level and no. of backup hours
parameters of lead-acid batteries. Since the batteries, which
would be used in the hybrid electric vehicle (HEV), are
lead-acid batteries, they will be the focus of this project.
While the present prototype system accounts only for
measuring backup hours of a car in a stationary as well as
in a running mode. With the help of this, we are able to
know the battery life span and its efficiency. Data backup is
also provided to save the all records of battery.