On FLAC 16/44, vol 50, EQ off, LCD off, normally I can get about 10-11 albums.
But I never listened non-stop.
NP, that's the official battery test from AK on the 14 hrs battery life, so I just paste it here for your reference and test.
I read it and I still have no idea why he thinks that way (grounding maybe?), but I did found something on LiPo charging circuit design that you may find interesting. Also I stand by my original point as a within spec USB device will able to handle the current. It might shorten the life of the battery, but no real harm to the device should come to it.
My point is that he should have never feel something like that in the first place even with an iPad charger at 2.1A, let alone 1A, so I think there is something else going on with his AK120. If I have an iPad charger I will gladly test this out with mine, but I don't have one...
It is made in Korea, since it is korean company.
Are you sure his ak120 is made in China?
make sure it is same as the picture below
If you want the best answer...ask iriver directly: firstname.lastname@example.org
You can ask your friend to ask iRiver directly if his set is legit or not :p