Summary

Here is a set of caps for Inductrix style lipos, in my case nitro nectars from https://newbeedrone.com.

There are two models with different letters on top. One comes with an F for full and the other with an E for empty. You could also print them in different colors, but I had only transparent filament and therefore went over the letters with a permanent marker.
I printed mine out of filaflex, which is basically TPE.

Print Settings

Printer:

Kodama Trinus

                                            <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.2</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>50%</p></div></p>

Nitro Nectora / Inductrix battery cap