Magnets are underutilized in today's society. You can help fix this by using a magnetic battery holding system for your multirotor. Uses two 25.2mm (1 inch) magnets in combination with two steel washers taped to the battery. (Recommended not to be used near a magnet compass for obvious reasons) -Buy magnets like this or similiar: http://www.ebay.com.au/itm/One-Small-Disc-Rare-Earth-Neodymium-N50-Grade-Magnet-25mm-x-10mm-Ring-Hole-5mm-/171193250638?hash=item27dbe9b34e -Print required holder -Glue magnets to holder -Zip tie holder to frame -Tape washers to battery 60mm apart at the center