There doesn't seem to be any technology partnership, only marketing. The GE web site says only "GE/Sanyo batteries and related products are sold by Sanyo under a license from General Electric Company" and then directs you to the Sanyo website. In my opinion, what this means is that Sanyo pays GE to add the GE name to the batteries for marketing purposes. Might even be worth paying for, the GE name is still one of the most instantly recognized by consumers.