Podalinskii Yu. A. RussiaSt.-Petersburg JSC NIAI Istochnik, 10, Petrograd party, Dahl St., Saint Petersburg, 197376 Author's articles Volume changes of active materials during discharge of lead-acid cell The electrolyte density in the lead acid battery VRLA electrodes , pores About corrosion stability of the leaden alloys for stationary battery The optimization of the electrodes height of stationary lead acid battery The changing of stationary lead acid battery parameters with use of the corrosion-proof alloys Main trends in chemical power source design at NIAI Istochnik Corp