Take the small vac. out of the main unit. Check the contacts on the inside of the main unit and also on the back side of the small vac. Be sure they are all clean and that none are bent. Check also the back of the main unit to the base contacts; same here make sure they are clean and free of dirt. Check the transformer wire from the wall to the base fell for hot spots or kinks. If all these things are in good shape, last ditch is to put the small vac. in a zip lock freezer bag and put it in the freezer over night and then try to re-charge it. It that does not help. It should have some warranty left. I think it has a year of warranty. See web site >>>> Warranty Info. Hope this helps.
The battery replacement for the PRONTO is not a consumer level maintenance procedure. However, you can replace the 4 original EMX1600sS batteries . The battery model is Tenergy 2/3A Size Rechargeable Battery 1.2V 1600mAh NiMH W/ Tabs Those are a little smaller than the originals but with the same capacity of 1600mAh and can be easily found in the web. Anything under those specs should work.
Then also there may be a recall on the transformer charger unit. Check with Support for there help on that.
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