An iPhone 11 battery is rated for roughly 500 full charge cycles before capacity drops below 80%. Most 2019-era devices are now well past that point, which is why battery swaps remain the single most requested repair in independent shops.
Five signs the battery is done
- Unexpected shutdowns at 20–30% remaining charge
- Battery Health showing "Service" or below 80% maximum capacity
- The phone dies overnight even in airplane mode
- Random brightness dips and frame-rate throttling during normal use
- The back glass is warm to the touch while idle
Checking health before you quote
Always verify in Settings > Battery > Battery Health & Charging before selling the job. If Maximum Capacity is above 85% but the customer still reports shutdowns, the fault is more likely a power flex issue or charging IC — replacing the battery will not fix it and will cost you a rework.
Choosing the replacement cell
For iPhone 11 batteries, the practical tiers are: original-spec cells with genuine TI chips (no popup message), high-capacity copies, and budget cells that trigger the "Unable to verify" warning. At ScrnFix we stock cells that report normally in Battery Health and support a full charge-cycle QC report — check availability in our wholesale battery collection, or browse all parts for the iPhone 11 family.
FAQ
Will Battery Health show 100% after replacement? With original-spec cells, Health data resets and displays normally. With cheap copies, iOS shows an "Important Battery Message" instead.
What is a safe MOQ for testing a new supplier? A supplier worth working with accepts a small trial order — we ship battery trial lots worldwide with DHL express.