Blackberry — battery meter problem with bb z10

Address:

Coimbatore, Tamil Nadu

customer name: arunmodel: blackberry z10 os: 10.2 sir iam having serious issues with this z10 phone. yesterday i charged my phone to 100% and used it for more than 8 hours without any problem, but when battery level reached 47% it said 'power of'' and got automatically shut down, i pressed the power button and there was no response at all, tried removing the battery and and again tried to on, it did not response. then i plugged into my charger and the phone switched on, when i saw the battery % it was 13. i don't know why this is happening. again i tried to drain my battery to zero. it showed zero but when i restarted it showed me 30%. iam really scared. i love this mobile and all its features, but this problem makes me worry a lot. i have attached a screenshot of battery stats here. u can see the graph rapidly decreasing from 47% to 9%. i seriously hope there is a solution for this problem. thanks in advance.