Draining Battery past battery safety shutoff

I have an iPhone 6 that has been coming to me every couple of weeks for several months with the phone completely dead. Not the red battery screen dead but so drained of power that when I test the voltage on the battery it is below 2 volts. I have replaced the battery 3 times and I have even designed a force charge system that will raise the voltage on the battery until the battery begins allowing a charge again (I know, dangerous). I am tired of having this issue and have run out of possible solutions. Any ideas?

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hriebl does the phone charge the battery at all?

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