Lithium surface abundances obtained in our models at the age of 12.5 Gyr. Each model includes an accretion episode of AGB wind at a specific age depending on the AGB mass. The left column presents the Li results according to the stellar effective temperature. The vertical accumulations of symbols correspond to proto-CEMP models of respectively 0.7, 0.75 and 0.78 M_⊙. The various metallicities of the models are represented by the shapes of the open symbols and the accreted masses by their various colours. In the right column, the lithium surface abundances are displayed as a function of the [Fe/H] ratio obtained in the same stars at the same age. The grey squares represent the observations (see text for details), light-grey squares are upper limits. The black dotted line is the SBBN lithium abundance that has been used as the initial abundance in our computations.