US tech giant Apple late on Thursday apologised for slowing down older iPhone models 6, 6s, 7 and SE to prevent abrupt shutdowns. It also announced a cut in the cost of battery replacements to $29 from $79 and a battery health software update early next year. Apple is facing lawsuits since last week claiming it did not seek consumers’ consent to slow their devices. Defending the introduction of features to cope with ageing batteries, the company said they help to make phones last longer. The company said it did not indulge in tactics to drive customer upgrades. Ageing lithium batteries deliver power unevenly which could cause iPhones to shut down unexpectedly endangering the delicate circuits inside, the company said.