Lenovo Vibe Z2 Pro (K920) battery charging time

Hello everyone,
I wonder, if anyone could help me, please.
I'm experiencing an interesting issue related to battery charging procedure of brand-new Lenovo Vibe Z2 Pro (K920).
The thing is, the first two battery charging procedures took about let say 2 hours 40 minutes both.
But the third battery charging procedure took about 3 hours and 10 minutes exactly!, which I consider to be rather strange, mostly because of web reviews of this smartphone, where 2 hours and 30 minutes typical charging time is described.
I understand the fact that brand-new battery has to be initially "formatted" and it's capacity is therefore gradually increasing after few battery charging attempts.
Needles to say, after that third battery charging procedure, the battery life has been also significantly improved. I use genuine Lenovo charger which comes with the phone in the box. The only thing, which I changed since first two battery charging procedures, was turning ON "Core efficiency" in the Lenovo Battery Manager.
Could it be the reason of such extended battery charging time or is it perfectly normal bacause of gradually improving capacity for brand-new battery? Could it be defective battery? Has anyone of the owners the same experience or what is yours typical battery charging time using in-box charger?
Thanks in advance for any advice, suggestion, explanation.
Martin

Hi All,
Thank you for bringing this to our attention.
I will check the battery charging issue item.
Hi tedulus, I don't understand what do you mean by the screen being too sensitive.Care to explain a little bit?
Check out the Community Knowledge Base for hints and tips.
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