I successfully replaced the battery myself. My first iPhone developed the touchscreen disease problem about 2 years after I purchased it. Apple is criminal for not recalling the iPhone 6 and 6 Plus and offering a voucher or replacement with a better-constructed model. I then went through five more iPhone 6 Pluses trying to get one that works, four of those within the warranty period. Three times Apple sent me a refurbished replacement iPhone 6 Plus that had touchscreen disease right out of the box! I got my last one after the warranty expired by threatening to get an Android. The last one got the disease after about one year. I researched the problem and discovered that one or two chips needed to be replaced. The cost and time element was prohibitive. Then the only person for over 100 miles in all directions capable of microsoldering replaced my iPhone 6 Plus’s Meson chip and the problem was finally gone. Then the new chip must have used battery power faster since the battery quickly deteriorated.
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