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 1M LiPF6 in a mixture of ethylene carbonate and dimethyl carbonate. Capacities in the order of 10 mAh g−1 over 30 cycles were observed. © 2005 Elsevier B.V. All rights reserved.