Title: 2 units died when left on more than 4 hours!
Review: I had the original charger which is no longer manufactured for over 4 years. After it died, this model was substituted and I had two replacements both die the same way (being left on overnight). Now I have to use a manual timer which shuts power off after 3 hours.Weird....Ryobi was nice but said that's just the way it is...
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