In the past 6-8 weeks and not during the CNY holidays I have received 7 out of 10 batteries that are bad. 5 Autos all defunct, mostly they would turn on, then stay on for 5 sec then blink. No puff control at all. The first manual had the button stick. I returned them, got replacements-I paid EMS to get them back. Now another is defunct. So with 7 batteries bad out of 10 I paid about $25 each. I used the HG 'contact us' a few days ago but havent heard back. I hope it was just a bad lot. But from now on I will pay $20 for local batteries....less hastle. I had not asked for any thing in return. The email I sent to Amy is available if anyone wants to read it.