I love my little lifepo4 jump starter battery. I wanted to add an extra xt150 connector for use with my new smart jumper cable. Here is how I did this upgrade mod.
Step 1: The Parts.
An xt150 male, led battery meter and a normally open micro switch.
Step 2: Attached the Xt150.
I used my 100watt soldering iron to attach the connector to the battery terminals.
Step 3: Attaching the Battery Meter.
I wired the meter and switch in series then glued them onto battery. Pressing the micro switch will turn on the led battery meter.
Step 4: Insulation!
Copious volumes of liquid tape on the terminals to prevent future electrical faults.
Step 5: All Done!
Here is my improved portable jump starter. With the smart jumper plugged in, the green led blinks. If I short the clamps, the red led blinks and it beeps! No electrical fault and damage to the battery for accidentally connecting it wrong.