Bridge the 500mAh connection on the micro lipo usb lipoly charger by applying a good amount of solder to the two golden pads.
This will make it so you charge the battery at 500mAh for a fast charge rate
Grab a set of wires with a JST male connector that's about 60mm in length (you probably have the one that came with the miniLipo charger!) Insert the positive and negative wires through the right mounting hole. Strip the wires and place the exposed wire into the GND and BAT pins.
Flip the charger over and solder the black wire to GND pin and red wire to BAT
This cable will let you connect to the PowerBoost easily