iPhone 6 battery draining fast all of a sudden? Here's the fix - YouTube
updated from ios 14.7.1 to 15.4. speed is great, apps won't unload from multitasking, and battery life amazes me. good update : r/iPhone11
Battery Life and Charge Time - The iPhone 6 Plus Mini-Review: Apple's First Phablet
iPhone 6 / 6s Battery Replacement || How to Replace iPhone Battery/How To Change iPhone 6/6s Battery - YouTube
2800mAh Battery for iPhone 6S, ZURUN High Capacity Li-ion Polymer Replacement 6S Battery Compatible with iPhone 6S (A1633, A1688, A1700) with Professional Replacement Kit Tools
iPhone trade-ins: The best deals online - CNET
How To Save Battery On iPhone: Improve Your Phone's Life | Macworld