Help on STC3100 calculations
Voltage is never "pulled from". I say that not to be pedantic but because it demonstrates that you don't understand the question.

Here is an STC3100 gas gauge IC datasheet.

Please use that to explain your question in enough detail that we can understand what yuou are trying to do and what you are seeing. NB NOT HOW you are trying to do, initially, but WHAT. If we don't know what you want it doesn't matter very much what you are doing :-).

Are you trying to measure capacity used (mAh or summed mA) or battery voltage or ??? .  

Report back.



Update:

Based on what you said, IF you are reading the correct registers and the IIC is working OK then you are correct. BUT it seems unlikely that you are correct- fotunately ;-).

Register 9 is the high byte for battery voltage.

Register 8 is low byte. 

16 bits is far more than is needed, but they clearly say bits 0-7 and 8-15.

As you say, the result should be in multiples of 2.44 mV.They say on page 15 "
The battery voltage is coded in binary format, and the LSB value is 2.44 mV"

Note that VTM_EOC must be set before reading battery voltage. Battery voltage conversions only occur every four seconds. They say - 


...To reduce the power consumption, a conversion takes 
place only every two seconds, alternatively for battery voltage and temperature (so each value is refreshed every four seconds) ...


So to be safe, read voltage and discard, wait 4+ seconds, read Voltage and process. VTM_EOC will be cleared by the read. 

Just swapping high and low bytes does not give a sensible result.

$E6 x 256 x 2.44 = 109,312 decimal ?

Are you getting sensible temperature results? If not, then this is a (further) indication that "something is wrong". If you*are* getting OK temperature results, what are you doing different.

Does the gas gauge count increment, and increment sensibly on repeated reads? If not, a further indication. CXan you reset the gas guage to zero under software conrol? If not then it would indicate that your IIC is not doing what you think it is.