Can replace my device?

Hello:) I would suggest below if you feel there is a problem with your iphone:

1. To start, you'll need to have the free Apple Store app installed on your iPhone or iPod touch. Download the Apple Store App here (link opens iTunes/App Store).
2. Once you've got it installed, open the app. You will be asked to grant a number of permissions, including for notifications and for the app to use your location. Grant permission to use your location and decide on the others as you prefer.
3. Tap the Stores menu at the bottom of the app.
4. Next, tap the Genius Bar menu.
5. On the next screen, tap Make a Reservation.

Make a reservation at nearest Genius Bar.

~Katana-San~

You’d need to take it to Apple or an Apple authorized service provider in Japan. Replacement under warranty has to be done in the country of original purchase. Since Japanese models have specific hardware configurations (e.g. the photo shutter sound cannot be disabled or silenced on Japanese phones) other countries will not have the replacement model in stock.

You had 14 days for the purchase date to return this iPhone for either a full refund or a replacement. After that the Apple limited warranty would take into effect ... or AppleCare+ plan if you elected to get that as well. Regardless, these only cover manufacturing defects. If that is what you are thinking this is (note that the battery "issue" you bring up will not be considered because it does not meet Apple's criteria for a battery replacement) an Apple technician will still have to examine this phone and concur. Otherwise, your only options are to keep the phone or sell it and buy another one at your cost.