I bought the V3 (ECOReader - Hanlin Clone in Australia) a few years ago and never had any trouble with it once I learned how to drive it - no problems with the battery at all. I bought a V3+ a year or so ago and also have had no problems with it. I read a couple of 200-300 page books (on magnification 5, making about 1200 screen pages) each week and usually do an overnight recharge every couple of weeks. Really the Hanlin v3 series is great to own and very economical if you don't need all the 'bells and whistles', internet etc. It is an eBook reader and that is exactly what it does admirably without any stress involved.
Wouldn't know anything about the Chinese language stuff - sorry.