Need help about mobile phone sound amplification

How many mobile phone battery is necessary to duplicate the power of one mobile phone ring? (in decibels) Example one mobile phone ring reach 70 dB, and I need that ring reach 140 dB, 2 mobile phone battery do work? (and one amplifying circuit obviously)

70 dB SPL is 10 dB over normal conversion and 140 dB SPL is 20 dB over the threshold of pain. The difference of 70 dB means that 10 million times more audio power is required to achieve 140 dB SPL.

I have not found the efficiency of a mobile phone speaker so let's use the efficiency of a "typical" home stereo speaker. That is 92 dB SPL for 1 watt of audio power. To produce 70 dB SPL requires 6.3 mW. To produce 140 dB SPL requires 10 million times 6.3 mW or 63,000 watts. Assuming a mobile phone battery can output 10 watts it will take 6300 batteries to produce 140 dB SPL.

Thank you for help me. I had very wrong about this, imagine the dificult for charging 6300 batterys!
Consider that i could hear my mobile, in a very noise enviroment, at one distance of 5 meters, if i use 3 batteries and one amplification circuit, and change the speaker for one biggest too, how meters of distance (in this same enviroment) it is possible to hear it?