... 4 charging docks – charges / regenerates AA, AAA, C, D or 9V batteries.--- Battery Protection – charge protects against over charge, over heat, short ... only charging of Li-Ion batteries and rejuvenation of alkaline batteries. Charger for from 1 up to 4 cells / batteries of size AAA, AA ... , 9 V.l Storage temperature for cells and batteries: from -20°C to + 30°Cl Operating temperature for charging: from 0 ...