A few insert options for the great model by Maxdarkdog of the Half Life HEV battery pack. I wanted more light out of the model, so this adds space for a 2nd LED tea light at the top, with a few style options for the center. It gives the effect of a central 'core' of the battery, large or small. The tea lights it uses are the 3 LED remote style on Amazon that are no more than a 31mm diameter. This should mount securely by sliding over the center piece of the original insert where the tea light goes. Designed to be printed upright without supports.
This would look really cool in glow in the dark blue, though I went with transparent PETG for now. Will update and post a make when complete, the rest of the shell is currently printing and more lights are on the way.