I created this battery holder since i just got a battery powered lawnmower and wanted to hang my batteries. I didn't see any holders so I designed this one. It works with my 2 Ah (29141, 40V DC 73Wh { http://www.craftsman.com/craftsman-40v-lithium-ion-battery/p-07198740000P }) and my 4 Ah (138.98742, 40V DC 146Wh { http://www.sears.com/craftsman-40v-rechargeable-lithium-ion-battery-98742/p-07198742000P }) batteries. I recommend printing this solid (90% fill). I hollowed out the bottom to save material and ta make printing with 90% fill feasible. You can print with light supports (I did) and it took about 12 m of my 1.75mm filament.