Hello   Those are part numbers for different versions of the Dell UPS 500w. J715N - High voltage, primarily for European marketsH900N/CH38X - Low voltage If your UPS is connected to a 120v outlet then it is low voltage. H900N is a kit that contains CH38X, so they are referring to the same UPS. Thanks
I have a Dell UPS 500W that I need to replace the batteries.  The online store has batteries for 3 different models but I can't find the model on the UPS any where.  How do I find which batteries to order? The have model options for CH38X, H900N and J715N. I can't find a serial # or model # on this thing.  Where are these located? Is there a UPS support forum, couldn't find that either so hopefully this is the best place for this question.
Dell UPS 500W find model number