TY JOUR TI TO THE MAINTENANCE OF THE FIRE TRUCK IN OPERATIONAL READINESS WITH AN AUTOMATIC BATTERY CHARGING KW fire engine KW battery KW step charge method KW voltage KW charge current KW current sharing JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Presnov, A.I. AU Danilevich, A.V. AU Aleshkin, A.A. PY 2016 IS 2016 PB Saint-Petersburg University of State Fire Service of Emercom of Russia