The use of rechargeable batteries as a prime power source is on the rise. Among the most widely used sources used to supply portable electric and electronic equipments are Nickel-Cadmium (NiCd), Nickel-Metal-Hydrid (NiMH) and Lithium-Ion (Li-Ion) batteries. By adequate charging batteries will feature better performance and longer life cycles. The paper presents the charging modes allowing for a long-term constancy of their functional parameters. The algorithms used in the adequate charging of the NiCd, NiMH and Li-Ion batteries are described of the typical charging processes and a new charging approach.