Walmart and Energizer were ordered by a US judge to face lawsuits by consumers and retailers accusing them of violating antitrust law by conspiring to raise prices of batteries.In a decision on Friday, US District Judge P. Casey Pitts said plaintiffs in the three proposed class actions plausibly alleged that in exchange for preferred treatment at its stores, Walmart pressured Energizer to inflate wholesale battery prices and keep other retailers from undercutting it on price.The plaintiffs said the alleged ...