iPhone 8 Plus Battery Basics
The iPhone 8 Plus was one of the first iPhones with Qi wireless charging, launched alongside the standard 8 and the iPhone X, and its larger dual-camera body carries a noticeably bigger battery than the standard 8.
What Made the iPhone 8 Plus Special
The 8 Plus was the last large-screen iPhone with Apple's classic Touch ID home-button design, launched alongside the iPhone X as Apple briefly sold both design generations side by side. It introduced Qi wireless charging and a glass back (needed for that wireless charging) to the larger Plus-size iPhone for the first time.
How the iPhone 8 Plus Battery Ages
Now several years past its original 2017 launch, the 8 Plus is old enough that essentially every unit still in daily use is well beyond the roughly 500-cycle range where meaningful capacity loss is expected - calendar aging alone, independent of how much the phone has actually been used, is enough to have degraded most original batteries substantially by this point.
Signs You Need a Replacement
At this age, expect noticeable degradation as the norm rather than the exception: Battery Health readings well below 80% (Settings, then Battery, then Battery Health & Charging) are common on 8 Plus units still running their original battery, and unexpected shutdowns before 0% are a frequent, well-documented complaint for this model at this age.
What a Replacement Costs
As an older, well-established model, the 8 Plus tends to have relatively affordable battery replacement options, with parts still widely available given how long it's been in service and how many were sold. In-warranty coverage isn't realistic at this point, making this an out-of-pocket cost - generally on the more affordable end of what you'd pay across the iPhone lineup.
DIY vs. Professional Replacement
The 8 Plus uses stretch-release adhesive strips for its battery, and being an older, thoroughly documented model, DIY guides and parts remain easy to find years after launch. The core safety risk - puncturing the cell while freeing it from adhesive - is the same as on any iPhone, and the main reason professional repair remains the more cautious default for anyone new to this kind of work.
Tips to Make It Last Longer
For a phone this age, checking Battery Health directly and deciding from there is more useful than trying to extend an already well-worn original battery through new habits. Once a fresh battery is installed, avoiding heat exposure and keeping Optimized Battery Charging enabled both help the new cell last as long as possible going forward.
Is the iPhone 8 Plus Still Worth It in 2026?
For 2026, the 8 Plus is a genuinely old phone, and buying one used makes sense mainly if you specifically want Touch ID or a lower price point over newer features - performance is adequate for basic tasks (calls, messages, light browsing) but not much beyond that. Assume the battery needs replacing regardless of what a quick test suggests, given its age; a fresh battery is a small cost relative to what you'd pay for a newer phone.
Frequently Asked Questions
Yes - the 8 Plus was among the first iPhones with Qi wireless charging support, along with the standard iPhone 8 and the iPhone X. This doesn't affect battery replacement cost or process either way.
If the phone still meets your everyday needs and you'd rather not switch devices, yes - it's an affordable, well-established repair that meaningfully extends its usable life.
The 8 Plus carries a noticeably larger battery, matching its bigger body and dual-camera system - both aged the same way chemically, but the Plus generally lasts somewhat longer per charge even after equivalent degradation.
Most mainstream apps continue to support it as long as it's running a reasonably current iOS version, though some newer apps may eventually require an iOS version the 8 Plus can no longer update to - check Settings, then General, then Software Update for what's currently available.
