As indicated in its official blog, iFixit has decided to formally lower the pricing of its iPhone battery replacement kits to just $29, effectively matching the $29 price being charged by Apple in order to replace batteries of old iPhone units that Apple has slowed down. For those still not in the know, earlier this week Apple had issued an official apology for slowing down the processing speed of some old iPhone models in order to prevent them from randomly shutting down whenever the battery is not charged enough or when used in cold climates.
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https://www.wirefly.com/blog/news/ifixit-s-pricing-battery-replacement-now-reduced-29