Easy 1h print with small outline.
I used a spare 600mAh from a crashed quad...
Just added a cheap power bank module from eBay (2pcs for 1 Euro included.shipping).
Search eBay for "Powerbank module" and sort cheapest first!
His has indents to hold the module securely in place,
Cover is snap fit, you can add a drop of super glue for permanent closure.
The author marked this model as their own original creation. Imported from Thingiverse.