Macworld For the first six months of owning an iPhone 15 Pro Max, my battery health never dipped below 100 percent. That might not seem like a big deal, but when you consider my iPhone 14 Pro Max lost about a percentage point each month the previous year, I was extremely impressed by the battery’s ability to retain its full capacity so long after I bought it. In the past three weeks, it hasn’t been so great. In early April I noticed that my battery health had finally dropped to 99 percent, as expected after six months of use and daily charging. But throughout April and May it’s dropped about o…