My initial attempts at tractor conversions left no space for a battery in the models because I used through hole components an larger servos which took up way too much space. As a result I was expecting to need to provide power from a source external to the tractor and I taught a 9 volt battery would work perfectly. Since then I’ve miniaturised the design and have a bit more space to play with so I changed to 3.7 volt LiPo batteries instead.
TheÂ fertilizer spreader is an obvious choice for a battery pack because it is basically just a spacious box with a hinged lid, you really couldn’t get a more suitable attachment.
|SIKU Kuhn Fertiliser Spreader||1||â‚¬8.00|
|5 x 3.7VÂ LIPO Battery + Charger Set||1||â‚¬11.42|
|Male Dupont Pins||100||â‚¬0.88|
|Single Pin Dupont Housing||100||â‚¬0.88|
|Total (Only used one battery and two Dupont connectors Â in the build)||â‚¬11.00|
There is really nothing special about this build, I first drilled a small hole in the rear of the model to let the wires through, added a Dupont connector to one end because I use those on the tractor and threaded the wires through. Originally I put a 9 V battery connector on the other end of the wires because I had voltage regulators in the tractors but when I upgraded the tractors I settled on a 3.7 V design so I also upgraded the battery pack. I simply cut away the 9 V battery connector and soldered a 3.7 V LiPo battery there instead. This gives it way more power, around 650 mAh at 3.7 V compared to around 100 mAh at 9 V so it will last much longer.
Kuhn Fertilizer Spreader Video
There is oneÂ videoÂ of this simple battery pack which shows me upgrading it from my original design which used a 9 V battery into the design which works with my new tractor configuration using the 3.7 V battery.