Volkswagen luxury brand Audi is recalling its first all-electric vehicle due to the risk of a battery fire. The company issued a voluntary recall of approximately 540 E-Tron SUV models sold in the U.S. because of a risk that moisture can seep into the battery cell through a wiring harness glitch, spokesman Mark Dahncke said. The company isn’t aware of any fires or injuries because of the flaw, which affects a total of 1,644 models, he said. The E-Tron, which went on sale in the U.S. in April, is Audi’s first fully-electric car and one in a wave of contenders from traditional automakers looking to challenge Tesla Inc.’s dominance of the segment. While electric vehicles are no more prone to accidents or fires than gasoline-powered cars -- and might be less so, according the National Highway Traffic Safety Administration — the lithium-ion battery technology that powers them is still evolving, and there is no consensus on safe system design. Audi said there have been five instances globally where a battery fault light turned on because of the moisture issue. It began contacting E-Tron owners in the U.S. last week, prior to a warning from federal safety regulators, and should have a repair available by August. “We are applying an abundance of caution as no such incidents have been reported globally,” the company said in a statement. Audi said it’s offering E-Tron owners loaner vehicles and an $800 cash card to cover gas or incidentals during the recall period, as well as free roadside assistance. There are still E-Trons unaffected by the recall available for sale, it said.