TP4056 Lithium Charger cut off voltage
On many of these typical lipo chargers the small 6 pin chip is the over/under protection component. If that part is a DW01 (as it looks to be), then all of the parameters are preset internally.  

Even if you added a resistive divider to the sense pin you would be altering both the overcharge and undercharge values.  

Here is the data sheet for the DW01 chip: http://www.ic-fortune.com/upload/Download/DW01x-DS-17_EN_53550.pdf  

So if this does not match your requirements you need to buy a new board and/or try returning the original one.