Battery level on Lumia 525

[NarutoKP]

I am using my phone with 100%.But when I restarted my phone, it was only 30%. Can anybody help this problem?

 

[gpobernardo]

I am using my phone with 100%.But when I restarted my phone, it was only 30%. Can anybody help this problem?

This battery calibration bug has been observed in other phones as well. Just plug your phone to a charger and you should see your 30% charge jump up back to 100% (after a few minutes)... provided that your phone didn't take more than 30 minutes just to restart (if your phone took that long to restart, then that's the problem).