Purity Pro Battery-Level max 80 % after charging

Hello everyone,
I believe that the battery of my phones are broken. On a full charge my Lumia 920 displays only a charge of 80%. First I thought it was normal and it would adjust after a few charging cycles. But after 10-15 cycles it's the same.
Is this normal? Is there a way to reset the entire device? Something like a hard reset? or should I drain the battery completely in order to reset the internal battery meter??
Any help would be great.  

I couldn't find a way to edit my post.
I'm talking about the battery of my purity pros. Everytime I charge them, my phone displays the battery level of the purities below 90% most of the time 80%.

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