Hi EXT,
Whilst I can understand that Honda might reduce costs by purchasing Chinese batteries rather than Japanese ones, I find it hard to believe that they would compromise on quality. Honda have an unrivaled reputation for quality and reliability and I wouldn't have thought that they would risk that to save just a few pounds.
I have owned three consecutive Hondas, a 2004 Civic, a 2010 Civic and a 2013 Jazz and have only had one fault in those 8.5 years - pitted brake discs - my fault for not using the car sufficiently. Would they risk such reliability for such a minor saving? I would suspect that the Chinese batteries have been fully tested and found to be of a suitable performance and quality.
I have just checked my February 2013 Honda Jazz 1.4 EX CVT and it has a Varta battery (origin not stated).
Cheers, Geoff