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An acid status indicator for a battery, in particular for a lead-acid rechargeable battery, having a sight glass and a holder for holding the sight glass and for attaching the acid status indicator to a housing of the battery, wherein the sight glass and the holder are produced by two-component inje

An acid status indicator for a battery, in particular for a lead-acid rechargeable battery, having a sight glass and a holder for holding the sight glass and for attaching the acid status indicator to a housing of the battery, wherein the sight glass and the holder are produced by two-component injection molding, with the holder being produced by insert molding of the sight glass.

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1. An acid status indicator for a lead-acid rechargeable battery, having: (a) a sight glass (14) having a bead provided about the circumference of the sight glass and a head (22), wherein the bead is disposed in a middle section of the head, spaced apart from an upper end of the head; and(b) a holde

1. An acid status indicator for a lead-acid rechargeable battery, having: (a) a sight glass (14) having a bead provided about the circumference of the sight glass and a head (22), wherein the bead is disposed in a middle section of the head, spaced apart from an upper end of the head; and(b) a holder (12) for holding the sight glass (14) and for attaching the acid status indicator (16) to a housing (10) of the battery (11), the holder having an engaging projection which is received by the bead, wherein the bead is surrounded by the holder (12) in an interlocking manner, thereby preventing any movement in the axial direction of the sight glass (14) relative to the holder (12), the holder and the sight glass being connected to one another by a gas-tight shrink fit,wherein the sight glass (14) comprises a first plastic and the holder (12) comprises a second plastic, with the first plastic shrinking less than the second plastic when it cools down. 2. The acid status indicator as claimed in claim 1, wherein the sight glass (14) comprises styrene/acrylonitrile. 3. The acid status indicator as claimed in claim 1, wherein the holder (12) comprises polypropylene. 4. The acid status indicator as claimed in claim 1, wherein the sight glass (14) has a stepped end in order to indicate different acid levels. 5. The acid status indicator as claimed in claim 1, wherein the sight glass (14) has a projection at the lower end, which projection is used to hold a ball cage to indicate the acid density. 6. A lead-acid rechargeable battery, having an acid status indicator (16) as claimed in claim 1. 7. The acid status indicator of claim 1, wherein the sight glass (14) and the holder (12) are two-component injection molding parts, with the holder (12) being an insert mold of the sight glass. 8. An acid status indicator for a lead-acid rechargeable battery, having: (a) a sight glass (14) and(b) a holder (12) for holding the sight glass (14) and for attaching the acid status indicator (16) to a housing (10) of the battery (11), the holder being shrunk onto the sight glass and resting completely on the sight glass such that the holder and the sight glass are connected to one another by a gas-tight shrink fit. 9. An acid status indicator for a lead-acid rechargeable battery, having: (a) a sight glass (14) having a bead provided about the circumference of the sight glass and(b) a holder (12) for holding the sight glass (14) and for attaching the acid status indicator (16) to a housing (10) of the battery (11), the holder surrounding the bead in an interlocking manner, the holder and the sight glass being connected to one another by a gas-tight shrink fit. 10. The acid status indicator of claim 8, wherein the sight glass further comprises a head and a bead, wherein the bead is disposed in a middle section of the head, spaced apart from an upper end of the head. 11. The acid status indicator of claim 9, wherein the sight glass further comprises a head, wherein the bead is disposed in a middle section of the head, spaced apart from an upper end of the head. 12. The acid status indicator of claim 10, wherein the bead is surrounded by the holder (12) in an interlocking manner, thereby preventing any movement in the axial direction of the sight glass (14) relative to the holder (12). 13. The acid status indicator of claim 11, wherein the bead is surrounded by the holder (12) in an interlocking manner, thereby preventing any movement in the axial direction of the sight glass (14) relative to the holder (12).