My less than 1 week old ipad mini have the same issue as well. Did 1-1 exchange of the whole box and still not able to charge above 90%

Actually I've tried few methods proposed in multiple forums (for both initial purchased set and exchanged set )

1) recalibration as recommended by apple tech
result: stop charging at 90%
2) Switched power supple off and back on after few second
result: manage to charge to 100% eventually
3) Perform hard reset
result: battery percentage indicator from 89/90% - ard 94%

Even though method 2 works, I do not think it is how a gadget should behave. A non-faulty electronic gadget should be able to charge to 100% at one-go.

Let me repeat myself too, I've read and tried few methods proposed in multiple forums. Some possible 'solutions' like using iPhone's adapter or watnot, for some first time apple product buyers like myself, we just don't have spare apple adapters laying around the house But anyway, thanks for responding.

Anyhow, got another 1 to 1 exchange within 7 days of purchase and finally it is able to charge till 100% (AT ONE GO). According to the technical staff, the 1st shipment of adapters were faulty. Hope this helps