The present work has the general objective of validating, under real operation conditions, the technique (developed in a laboratorial environment) of remote monitoring of stationery batteries. The development of this MsC dissertation theme was motivated by the contributions that it is expected to give to the Light S.E.S.A. and other companies of the Electric Sector, Oil and Gas, Bank, IT and many others which use stationary batteries in their DC energy supply. Light and CPqD developed together a Research and Development Project named ReD Light-ANEEL 033/2008. This project had as its main objective to increase the reliability of the ancillary services of substations and to reduce their maintenance costs. To reach this target, was developed an automated monitoring system and a remote individual management of all elements that form the batteries bank. The MSc research evaluated, quantitatively, the reliability of the remote metering, performed to the Light’s Baependi substation, which is located in the south zone of Rio de Janeiro City. The methodology applied in this dissertation consists of statistical studies (Hypothesis testing parametric and nonparametric), for comparison of voltage and impedance results obtained in actual operating conditions (Measurements SIMBA-GEBAT) compared to portable measurement. The research has validated, to the significance levels of 90 per cent, 95 per cent and 99 per cent, the methodology used to the remote evaluation of batteries relatively to the impedance and voltage essays, and has also identified the repetitivity of the remote evaluation methodology. The research results were fundamental to prove the credibility of the remote monitoring system of batteries. The use of this system will contribute to increase the reliability of the equipments which use backup systems, besides promoting a cost reduction of the predictive maintenance.