This paper presents a low cost Battery Information System, based on intelligent modules to be embedded inside single battery cells. The module design is cost-optimized, including only minimal functionality to uniquely identify each cell, and measure voltage and temperature. Current measurement is accomplished be an addition module added to each series-connected battery stack, avoiding unnecessary cost of redundant current sensors. Data from several modules is aggregated via a time-triggered proprietary wireless network, and then relayed to a remote, centralized server over standard TCP/IP WiFi connection. The remote battery database is supposed to be installed at the battery manufacturer's server, and can potentially aggregate data from all manufactured batteries. Such an extensive database is expected to enable advanced analysis and modeling of batteries, as well as provide online monitoring and reporting services as an added value for customers.