Patent ID: 8252439

Claim:
A rechargeable battery having a housing comprising at least two cells that can be filled with an electrolyte, the rechargeable battery comprising: a degassing system having openings provided therein, a cover and the degassing system arranged such that the openings are located above the cells of the rechargeable battery; and a sealing plug provided in each of the openings, the sealing plug having an upper part and a lower part, the lower part comprising a splash basket that has an inner cavity that decreases in size from an upper end of the splash basket to a terminal end of the splash basket, wherein an acid level indicator is attached to the upper part of the sealing plug and the acid level indicator has a roughened surface; wherein the splash basket comprises a plurality of plates that extend from the upper end of the splash basket to the terminal end of the splash basket, the plates separated from each other by slots that extend to the terminal end of the splash basket such that the plates are not coupled together at the terminal end of the splash basket to allow free movement of the plates at the terminal end of the splash basket.