I have a Samsung Galaxy Nexus and a Samsung Galaxy Mini2.
In mid-August I lost my GNex battery charger; then I started charging the GNex with the Mini2 battery charger.
Their specifications are:
GNex : Volt 5,0 Ampère 1.0 Mini : Volt 5,0 Ampère 0.7
Since the second battery charger has a lower Ampèrage, it should charge the phone exactly like the original one, but taking more time;
In mid-September, the GNex started doing strange things: the charge was degrading faster than before (I'm used to charge it every two days, while from mid-september I charged it every day), and THE PHONE BECAME SLOW. I mean SLOW.
Even if restarted and powered on from few minutes, the Application button took about 4-5 seconds. Before it was instant and smooth, about 0.2 seconds.
In mid-October I found my original battery charger, and started using it again. After a couple of charges... the phone has returned to be superfast.
Talking with a friend (physicist), it said it must be a software (or hardware) thing. A wanted behavior set up in order to slow the phone down when not using the original battery charger. I said that it sounded a bit like conspiracy stuff, then he argued that it is more likely than the electrons remembering which battery charger transferred them and based on that deciding to slower the phone or not :)
Another friend (electrical engineering technician) said it is common practice (and brought examples from Laptop manufacturers's world);
Is this a known issue ? If yes, is this Google or Samsung's fault ? (Why on earth should they do something that stupid ? But this is rhetorical... )
Note: the "case study" is perfectly reproducible, the only requirement is to have two different battery chargers (with a different ampèrage) and a GNEx, but probably it is done on other phones too.