Over current protection for a 1-cell battery
You need to look in the data sheet for the DW01-P. One copy can be found here:

https://cdn.sparkfun.com/assets/learn_tutorials/2/5/1/DW01-P_DataSheet_V10.pdf

The device senses on the CS pin using a preset fixed voltage threshold. The discharge current limit is determined by the MOSFETs that you select. For quick reference here is the relevant text from the data sheet.


  Selection of External Control MOSFET
  Because the overcurrent protection voltage is preset, the threshold current for overcurrent detection is determined by the turn-on resistance of the charge and
  discharge control MOSFETs. The turn-on resistance of the external
  control MOSFETs can be determined by the equation: 
  
  RON = VOIP / (2 x IT) 
  
  (IT is the overcurrent threshold current). For example, if the
  overcurrent threshold current IT is designed to be 3A, the turn-on
  resistance of the external control MOSFET must be 25mΩ. Be aware that
  turn-on resistance of the MOSFET changes with temperature variation
  due to heat dissipation. It changes with the voltage between gate and
  source as well. (Turn-on resistance  of  MOSFET increases as the
  voltage between gate and source decreases). As the  turn-on resistance
  of the external MOSFET changes, the design of the overcurrent
  threshold current changes accordingly.