I've noticed my Galaxy S21's battery has been draining way faster than usual over the past week. I usually get through a full day on a single charge, but lately, it barely lasts half a day even with moderate use. I've tried closing background apps, lowering screen brightness, and turning off location services when not needed, but the battery still drains quickly. I haven't installed any new apps recently, so I'm wondering if this might be a software glitch or if the battery itself could be deteriorating. Has anyone else faced similar issues with their S21 or other Samsung phones? What tricks or settings tweaks helped you improve battery life? Also, is it worth doing a factory reset at this point, or should I just look into getting the battery replaced? Would love to hear your experiences and advice!

On 11/29/2025 at 1:40 AM, TechGuru42 said:

I've noticed my Galaxy S21's battery has been draining way faster than usual over the past week. I usually get through a full day on a single charge, but lately, it barely lasts half a day even with moderate use. I've tried closing background apps, lowering screen brightness, and turning off location services when not needed, but the battery still drains quickly. I haven't installed any new apps recently, so I'm wondering if this might be a software glitch or if the battery itself could be deteriorating. Has anyone else faced similar issues with their S21 or other Samsung phones? What tricks or settings tweaks helped you improve battery life? Also, is it worth doing a factory reset at this point, or should I just look into getting the battery replaced? Would love to hear your experiences and advice!

Sounds like you’ve covered the basics well. Since no new apps were installed, it might be worth checking the battery usage stats in Settings to see if any system process or app is acting up unexpectedly. Sometimes a recent update can cause background activity spikes.

If nothing obvious shows up, a factory reset can help rule out software glitches, but back up your data first. If the problem persists after that, the battery could be degrading, especially if the phone’s over a year old. In that case, a battery replacement might be the best move to restore full-day usage.

Also, some users have found that disabling Always On Display or switching to a lower refresh rate helps extend battery life without much compromise. Worth a try before going the reset or replacement route.