Smartphone battery life is affected by many factors including your phone usage, age and temperature. Above all, what affects how long your battery can last the most is your battery capacity. When it comes to having the best phone battery life, size matters. Not all smartphones have the same size battery, or the same charging capabilities. If you want the phone with the longest battery life, look for smartphones with the most mAh, like the Galaxy S26 Ultra, Galaxy A56 5G, Galaxy A36 5G, and Galaxy Z Fold7. The more mAh mobile phone has, the longer a phone can last between charges.

Setting your screen brightness at maximum brightness will of course require more battery power compared to minimum brightness. Therefore, turning your screen brightness down is one way to reduce your battery consumption.

As a rule of thumb, smartphones with larger screens like the Galaxy Z Fold6 also require more power to light up the display as they have more surface area. Models with higher resolutions and higher refresh rates will also require extra processing power. For example, having a 120Hz display means it will refresh twice as often as the standard 60Hz display. This requires additional processing power and therefore battery life.

How long your battery can last depends on how you use your phone. The main thing to note is that smartphone battery life usually gets shorter over time. If you open many applications at once, your battery is also likely to run out faster even if you are not actively using them. The applications can still consume battery power in the background, so it’s best to close any apps once you’ve stopped using them. Your battery also drains much faster when your phone’s temperature is high. You can check out our 'What to do when your phone heats up' guide if your phone heats up often.