When the power goes out for a long period of time I use my gaming PC's battery, it's called a UPS (uninterruptible power supply), it's a pretty big battery as it has to run a gaming PC even just for 5 minutes so I can go shut it down. If the power goes out for over an hour and it's winter, I just use it for the humidifier (I have a ball python) and the heat pads as they are low wattage and that battery can last a while. I have something that looks like this and costs around $200. The screen tells you how much time you have left with the wattage you are using, I can't remember how much time it gave me when I last used it for my ball python as it was so long ago and I also plugged in a 100 watt CHE that time and drained the battery faster than expected but I know it would last a while, I'm guessing at least 3-4 hours with just 2 heat pads and a humidifier and this is just a wild guess so don't take my word on that one.
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