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I disconnected the two batteries from each other and left them outside overnight to cool. And get this: two hours after removing them, the batteries still felt hot! I guess I’m lucky I didn’t have flammable hydrogen gas escaping as this thread says can happen. I finally managed to hook a wrench around the top and pull them out. The plastic pull tab broke off when I tried to pull out the batteries. When I got the battery door open, I could see the batteries bulged somewhat and were very hot. Of greater concern was that the unit was almost too hot to touch. For some reason there was no corresponding event in the PowerChute event log. Once I got on site, I found that the “Replace Battery” light was blinking. Of course the battery is not disconnected the connection inside the unit is a very secure clip that can’t just wiggle loose. I got an email from APC PowerChute Business Edition that said simply “Battery Disconnected.” The connected UPS is an APC SmartUPS 1500 model DLA1500 (the Dell equivalent of an SUA1500).
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