torpid whale

Does one need to use anything else (other than the battery controller) between the battery pack and ZY12PDN? because I connected them directly and my charger stopped working altogether. So I added a Boost converter in between the battery and ZY12PDN but ZY12PDN's light flashes, i.e. it charges for maybe 0.5 seconds and stops for 1 second or so. My batter is this one. and I have the correct PD charger. and my boost converter is capable of supporting the needed current.