Specific strange battery loading behaviour with EU-Charger - Galaxy S II General

FYI:
Ysterday I dedected a strange behaviour of battery charging:
While on Tuesday, when I received my SGS II it was charging quickly with the original EU-Charger while setting up my SGS II and then driving it to it´s (still unfound ) limits it loaded pretty fast up to 100 %.
Day 2 and 3 no prob at all.
Yesterday while filling up my 32gb SD card with music and videos over KIES air (SGS II charging with original charger) battery started to degrade while in action.
Ther I switched it off, let it load switched off for 2-3 hozrs and when starting up it showed only 94%.
Did not worry about this.
But last night I left it switched on and charging, showing that it is charging, but this morning found it stuck at 84% batt cap.
Switched it off, charged it for 1 hour, switched on and still on 84%.
Now I plugged in my travel charge adapter (hama USB Charger 5V 800mA), SGS II switched on in idle and within 2 hours it was full at 100%,
I suspect the original charger to be faulty .....................

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Hi,
I have a really weird problem with my Nexus 4 for a few weeks now:
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Regards,
Hidden
You can try to wipe batterystats.

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