iPhone par: Settings > Battery > "Battery Percentage" ON karein (naye iOS versions mein yeh battery icon ke andar show hota hai). Agar option ON honay ke bawajood percentage ghalat ya atak kar dikhaye — masalan 50% par hi ruka rahe — to phone ko ek dafa 0% tak istemal kar ke phir 100% tak full charge karein; isay battery calibration kehtay hain.
Agar percentage bar bar upar neechay jump kar raha hai (jaise 40% se seedha 15%), to yeh battery ke kamzor honay ki nishani hai aur battery check ya replacement ki zaroorat ho sakti hai. Kisi bhi surat mein battery ko khud kholne ki koshish na karein — phoolne ka khatra hota hai.
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