Cordless drill upgrade for about $40

Step 4 The battery assembly connecters

In the last step there was one battery holder outside of the battery, now you will make a smaller battery box out of aluminum. Start by making a paper model and check if it fits, then copy it in aluminum. The drill might require a spacer, so I used the converter box as a template to make one out of plastic, then used super glue to secure it. The final part is to drill some smaller holes and make a loop with some metal wire then use super glue to secure it.