Samsung Galaxy S21 Plus

The Samsung Galaxy S21 Plus houses a 4800mAh Li-Ion cell — a solid capacity for most daily usage patterns. Expect screen-on times of 6-8 hours depending on your usage mix of social media, browsing, and media consumption. Keep in mind that the 6.7" 120Hz display is a significant power consumer — so real-world endurance depends heavily on screen brightness and content type.

Wired charging tops out at 25W (USB Power Delivery). While not the fastest, it keeps charging times reasonable for overnight or desk-charging habits. Specifically, 0-50% takes approximately 60 min minutes, with a full charge completing in around 91 min minutes. Wireless charging at 15W adds the convenience of drop-and-charge, making nightstand charging effortless.

The charging ecosystem extends beyond basic fill-ups: reverse wireless charging at 4.5W for topping up earbuds or a smartwatch; battery health management (Adaptive Charging). The battery health features are particularly noteworthy — they help maintain long-term battery capacity by intelligently managing charge cycles, meaning the Samsung Galaxy S21 Plus should hold its charge capacity better over 2-3 years of ownership.

Note that a charger is not included in the box. To achieve the full 25W charging speed, you'll need a compatible USB-C PD adapter, typically costing $20-40 extra. Using a lower-wattage charger will work but charge significantly slower.