## 1 Introduction
It consists of an online monitoring panel for battery parameter measurements with a GPRS data transmitter unit and a computer equipped with battery online monitoring software, to monitor the various operating parameters of the battery in real-time. The authors further showed that through their system it is possible to judge the status of the battery, execute the fault diagnosis, and establish a database to facilitate data storage. Nonetheless, it should be noted that in most of the previous works, the systems designed were suitable for fixed batteries and the subsequent monitoring and connection with multiple batteries was not considered. Further, GPRS technology was used for battery data transmission and it may not be suitable for the industrial environment considering the low data rates. In this paper, a real-time monitoring system for multiple lead-acid batteries based on IoT, suitable for the industrial environment, is proposed and evaluated. Our proposed monitoring system procures and stores the important parameters of the battery in real time. We have developed a data acquisition system based on dedicated software and hardware. The wireless local area network (WLAN) is used as a backbone network considering the industrial environment. The information collected from multiple batteries is analyzed in an asynchronous transmission control protocol/user datagram protocol (TCP/UDP)-based [12] C\(\sharp\) server socket program running on a personal computer, to analyze the important parameters of the lead-acid battery; if required, appropriate decisions as to whether the batteries need to be recharged or not can be taken in advance to prevent excessive impairment to the batteries. Inter-integrated circuit, analog to digital converter (ADC), serial communication, TCP/UDP, and universal asynchronous receiver/transmitter (UART) are the protocols used for communication in our proposed system. The main objective of our scheme is to provide credible and valuable lead-acid battery data. From the utility point of view, our proposed system is designed to prevent battery damage caused by overuse, regardless of the low battery capacity; the cost can be further minimized and maintenance of the battery is relatively easier in our proposed system. Further, the data from multiple batteries are also displayed on an android device and are stored in a MySQL server database. We have developed a real prototype to devise an end product for our proposed system. In summary, the main contribution of this paper can be outlined as follows:  
* The real-time monitoring of multiple lead-acid batteries is proposed and evaluated through dedicated software and hardware. * Our monitoring system is based on WLAN for data transmission from multiple lead-acid batteries considering the industrial environment. * We have developed an asynchronous TCP/UDP-based C\(\sharp\) server program for our proposed system. * Further, we have developed an android program to display data from the connected battery client and this data is stored in an MySQL server database for mobile and robust monitoring. * We developed the blue print and schematic of our proposed system's circuit layout through ORCAD software [13]. * Finally, we have developed a real prototype to devise an end product for our proposed system. The rest of the paper is organized as follows. In Section 2, the system model is presented. The test bed implementation and the experimental results of our proposed system are shown in Section 3. Finally, conclusions are drawn in Section 4.