Previously Lithium Ion Capacitors (LICs) were 3.8V, however recently there are 4.0V and 4.2V LICs, and they have huge capacitance 1100F and 1300F. In another log I have tested capacitance and leakage of these huge LICs. 

Cda LIB1840Q4R0118 1100F 4.0V

BT LIC1840H4R2C1300 1300F 4.2V

In AEMLIC the charge voltage is set using 4 resistors and the values can be calculated using a spreadsheet found on E-peas AEM10941 product page. To test charging to a higher voltage I have adjusted a AEMLIC resistors R1 and R2.

to following values

In picture above) you see the disable voltage (~2.50), the enable voltage (~2.6V) and the charge voltage (~3.8V or ~4.0V or ~4.2V) and the resistor values. Always use 1% resistors. I have tested and confirmed AEMLIC is able to charge to these voltage levels. I do not recommend changing these resistors because you need serious soldering skills for these 0402 size resistors. I don't support questions about changing these resistors.