I found the "Li-Ion Battery Charger Solutions for JEITA Compliance" app note to be very useful, especially the temperature and current derating summary.
http://www.ti.com/general/docs/lit/getliterature.tsp?literatureNumber=slyt365&fileType=pdf
Is there an updated version in the works for 4.35V Li-Ion cells? Has JEITA even released guidelines for this yet?
Cheers,
Bryan