(of course would sony will say that, then theres the warranty blah blah line i'd suggest to sony thats why they dont get many return sales. stupid price stupid answer:)
if in doubt drop the vendor an email.
re-edit just to add ive bought a few they work fine
NP-BG1battery's are also lot cheaper if you shop around.
The difference in charger ?, nothing,, all made in roc.
for the price i bought one just to test quality etc still using it works fine.
HK ones may be iffy quality but i have had a few things from HK (via ebay) and all work just look for the 98%+ sellers.
USA plug-type here