The development of highly flexible fibre batteries based on conducting polymers is described. The performance of cells with polypyrrole-hexafluorophosphate (PPy/PF6) and polypyrrole-polystyrenesulfonate (PPy/PSS) is evaluated. Based on the results, fibre batteries consisting of a PPy/PF6 cathode and a PPy/PSS anode are fabricated and tested in an electrolyte of 1 M LiPF6 in a mixture of ethylene carbonate and dimethyl carbonate. Capacities in the order of 10 mAh g(-1) over 30 cycles were observed. (c) 2005 Elsevier B.V. All rights reserved.