The typical issue the user leaves data apps running that repeatedly are hitting the network. Also, data apps that are set to run in the background when closed. And leaving the browser open to an active web page. ... Rule out those possibilities.
But also, you seem to be saying the battery was on the charger all night and the battery was still low. If you are sying that, then it's a different issue, and first step is probably to try another battery. But make sure your charger is working. If you are using USB, rule out a problem with the cable or the USB port. Etc.
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