Samsung replied] I noticed heavy battery drain on my Galaxy S21 FE after installing Android 13 - Sammy Fans
Amazon.com: Fey-US Galaxy S21 Plus Battery Case, 5000mAh Rechargeable Battery Charging Case for Samsung Galaxy S21 Plus 6.7",External Backup Battery Power Bank Charger Case,Extended Your Battery Life Black : Cell Phones &
Samsung Galaxy S21 battery life — the results are in | Tom's Guide
S21 battery life - Samsung Community
Which 2022 Samsung Smartphones Have the Best Battery Life?
Samsung Galaxy S21 Ultra with an Exynos 2100 SoC sinks in DxOMark's new battery - NotebookCheck.net News