I often use my phone to tether internet, which it's the primary internet modem when I want to surf the internet on my computer. I have noticed that when I use my phone as tethering modem, it does drain the battery power, which it only lasts about 2 hours. When I play games on my phone, which I don't play as much as I used to, my phone will last between 3 to 4 hours, depending how much time do I spend on playing games. I personally think that using the phone as a tethering modem does drain the battery faster than anything when you use your phone for. I would just plug my phone to the wall charge every time I turn on the tethering feature.
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