I have just replaced my H340's battery with a Cameron Sino purchased for 15 UKP delivered from Hong Kong to the UK - even came with a little plastic paddle to help separate the case - can't comment on the longevity yet as it is getting it's first charge, but at least the box boots up
Link is
http://cgi.ebay.com/ws/eBayISAPI.dll...m=320079751752
Thought it was cheap enough to try it
Cheers
Chris