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The 18500 cells that come with the PowerPLAY are, well, crap, for legal reasons involving shipping products with lithium cells installed. Tony Cake had a go at modifying his case to accomodate 18650 cells but they won't fit if you solder wires on or install battery contacts, so I used that .STP file to create a case that can hold 18650 cells using the original battery contacts, allowing easy removal/installation, and it can still clip into the goggle strap holder. One small downside is that the height is increased by about 12mm to accomodate the 18650 cells at a 9 degree angle inside the DVR. But hey, longer run times and 18650 cells are much more easily available with bigger capacities. muteFPV has done a wonderful video showing the conversion steps. Big big thanks! Check out his amazing channel: https://www.youtube.com/channel/UCBptTBYPtHsl-qDmVPS3lcQ Upgrade steps: 1. Download PowerPLAY_18650.zip and print the case & battery cover parts in PLA, 0.2mm height, support on build plate only. This will take about 7 hours.  2. Remove every single piece of support material from the parts, then with a thin screwdriver punch down through the holes from the top where the screws go & remove the excess material. I put 0.2mm high 'bungs' in to avoid having support material going up into the screw channels as that's really really difficult to remove.  3. Eject the memory card & take off the battery cover of the PowerPLAY, remove the 18500 cells and undo the screws, then place it on a surface and gently hold it down by pressing on the screen, then lift the top cover off. 
4. Carefully lift up the LCD screen and then lift up the tab at the back of the connector for the ribbon cable, slide the cable out and put the LCD screen to the side.  5. Desolder the two battery contacts, gently pull the main board upwards as you heat the solder on the contacts to separate them. Make sure you get as much solder off the tabs as possible after the board is removed. 
6. Bend the tab on the single-wide battery contact vertical, pull the 3 battery contacts out from in the battery bay, pushing them down by their tabs first will help. 
7. Install the contacts in the new printed case, the individual ones go in from the top and the single-wide contact goes in through the battery bay. 
8. Slide the main board up against the battery contact tabs then slot the other end with the power & AV sockets down into the printed case. Solder the battery contact tabs to the main board. NOTE: You might have to file down the small nub next to the - hole in the battery holder, it should push the board up just enough so the power button is in alignment with the green sticker. 
9. Make sure the back of the LCD ribbon cable connector is lifted up, slide the LCD ribbon cable cable in and press the back tab of the connector down to hold it in place.  10. Screw the top on. Put your 18650 cells in, with the correct polarity as indicated by the + & - in the battery bay. Put the battery cover on. Go fly. 
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