[Q] Stock Nexus 5 Charger topic

Hey XDA'ers.

A quick history of my situation:

Last week my Nexus 5 32GB (3.5 months old) died during the night whilst it was on charge. Phone KIA. Google sent me a refurb Neus 5 32GB phone which I have been using for 3 days now.

The Nexus 5 which died was getting a nightly charge from an official iPad charger and my original Nexus 5 USB cable with a QI charging pad http://www.qi-wireless-charging.com/...er-Pad-T5.html. I think the iPad charger is rated at 2.1A.

Now my new Nexus 5 is here I decided the iPad charger working the QI charging pad may be stressing the battery so I have now gone back to the official Nexus 5 charger and QI charging pad. For the last 3 nights my phone has gone on charge around 10:30pm with about 20% battery remaining - I wake up at 7:00am and my phone is roughly 65% full. This has happened 3 times in a row so far.

So...................is it a case of the QI charging pad I have is rubbish, or is the Nexus 5 charger not giving it enough juice??

I have no idea why I am thinking the higher iPad charger killed my last phone - is this at all possible through a QI charging pad?