Start with usage
Apple recommends reviewing consumption by app in battery settings. Background activity means an app used energy while another app was in use.
FinFly Explains / Gadgets
Why a phone battery drains fast
Fast discharge does not prove a faulty battery. Display brightness, connectivity and apps change consumption; runtime between charges differs from battery lifespan.
Check conditions
The manufacturer highlights brightness, weak signal and temperature. Comparing days without considering usage is inconclusive.
Charges versus cycles
A cycle is cumulative use equivalent to full capacity, not each connection to a charger. Several partial discharges can make one cycle.
Change one factor
FinFly recommends comparing similar periods and workloads while changing one setting. Disabling everything at once obscures what helped. Menu names vary by device and software version.
Questions
Short answers
Do five charging sessions mean five cycles?
No. Cycles reflect cumulative charge use, not the number of connections.
Method
Primary sources
The explainer is checked against these institutional and industry sources. Links open the original material.