New Delhi, Oct. 28 -- Battery life is becoming a common concern among iPhone users. The percentage drops for no obvious reason, even when the phone is resting untouched on a desk. There's no gaming, streaming, navigation, or camera use involved, yet the power bar continues to fall throughout the day and even overnight.

While many instantly blame ageing batteries, recent software updates, or too many installed apps, the real cause often hides deeper inside the Settings menu. A lesser-known feature silently keeps apps active in the background, quietly draining power when users least expect it.

Most modern iPhones are designed to retain around 80% of their maximum battery capacity after several hundred charging cycles. So even if your devi...