If I Change My Iphone Battery Will I Lose Everything. Jan 16 2018 737 PM. However if Apple replaced your battery they likely wont do this for you.

After a little less than a year and a half of use I noticed the battery life began to take a sharp downturn. If there isnt a big change while in standby youre probably okay and your battery life will return to normal when your usage returns to normal after the novelty wears off. Your iPhone will charge again when the temperature drops.
If youve had your iPhone for awhile you may have noticed that it doesnt last on one charge as long as it used to or that its slowed down considerably.
This is true for Apple and Android phones. I would always be safe and back up everything before you change your battery or have someone else like Apple replace it. If there isnt a big change while in standby youre probably okay and your battery life will return to normal when your usage returns to normal after the novelty wears off. Apple recently acknowledged that their lithium-ion batteries gradually lose their ability to maintain a full charge over time.
