Battery advice is where good information goes to die. Most of what people repeat was true — for nickel-cadmium batteries, thirty years ago. Modern phones use lithium-ion. The rules are different.
Myth 1: Overnight charging destroys the battery
False. Your phone stops drawing meaningful current at 100%. Most modern phones also delay the final charge to 100% until just before you wake up.
Myth 2: You must drain to 0% before charging
False, and actively harmful. Deep discharges stress lithium-ion cells. The healthy range is roughly 20% to 80%.
Myth 3: Third-party chargers ruin your phone
Mostly false. A certified charger from a reputable brand is fine. A $2 cable from a petrol station is not.
Myth 4: Closing background apps saves battery
False. Force-closing apps means the system must fully reload them later — which costs more power, not less.
Myth 5: You should turn off Wi-Fi to save battery
False. Wi-Fi uses less power than mobile data. Leaving it on usually helps.
Myth 6: Fast charging damages your battery
Partly true. It generates heat, and heat is the real enemy. Occasional fast charging is fine. Fast charging in a hot car, daily, is not.
Myth 7: Batteries have “memory”
False for lithium-ion. This was a nickel-cadmium problem. It hasn’t been relevant since the flip-phone era.
What Actually Kills Batteries
Heat. Then time. Then extreme charge levels. In that order. Keep your phone cool and you’ve solved 80% of the problem.