Transport for London (TfL) has warned commuters of potential risks when using Apple Pay to pay for journeys on the city’s public transport network, including a flat battery that could result in penalty fares and the possibility of being charged twice if they carry both an iPhone and Apple Watch. The notice comes in the week Apple Pay launched in the UK. Meanwhile, London Evening Standard reports that passengers using contactless bank cards were penalised by almost £8m in eight months “after failing to touch out at ticket barriers”.