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Hi my friend,
What i suggest is pls check the battery life with the inbuilt menu in sony like digonastic and then if the graph is dopping suddenly better u change the battery. If u are charging ur mobile frequently this ill cause. so after changing the new battery charge upto 8hrs first and then charge until full and next charge when the batterry drains upto 15%
We'll need more info to better assist you
charge the phone 100% use it as you normally would then once the battery reaches 10%
settings > power management > battery > take screenshots of:
1. the list
2. tap on the graph and take a screenshot
3. back > tap on the top 4 items on the list > take a screenshot of each
post them all here or upload the screenshots to box or dropbox or google drive or etc and post the link