Home Phones News Xiaomi’s battery upgrade program is exactly what old iPhones need Xiaomi 13 Ultra Andy Boxall / Digital Trends Xiaomi has long been accused of taking inspiration from Apple. But this time around, the inspiration needs to move the other way. The company has expanded its paid battery upgrade program in China to cover the Xiaomi 13, Xiaomi 13 Pro , and Xiaomi 13 Ultra . Unlike a typical battery replacement, where a company simply swaps the worn-out cells with the same capacity, Xiaomi is offering larger batteries that give older phones a boost in endurance. Wait… a battery upgrade years after release? Xiaomi 13 Ultra Andy Boxall / Digital Trends According to details shared by Xiaomi President Lu Weibing on Weibo, the standard Xiaomi 13 can move from a 4,500mAh battery to a 4,850mAh unit. The Xiaomi 13 Pro gets a bigger jump from 4,820mAh to 5,361mAh, while the Xiaomi 13 Ultra goes from 5,000mAh to 5,500mAh.…