Makita 21700 Battery 18V

thingiverse

Hi everyone,\r\nsince Makita hasn't released a 21700 battery yet, I created my own.\r\nYou can get these batteries from Bosch or Milwaukee and possibly other brands too.\r\nIt's challenging to print this design, particularly the tool connector, which requires a lot of support.\r\nI used ABS for printing and would recommend avoiding PLA since it doesn't feel right for high-temperature applications like this battery pack.\r\nPETG should work fine as well.\r\nYou'll also need 21700 cells.\r\nFor the one-row version, you'll need five cells, and ten cells for the two-row version.\r\nI used Molicel INR21700-P42A cells to get 4AH or 8AH battery packs.\r\nhttps://eu.nkon.nl/molicel-21700a-4200mah-30a.html\r\nUnfortunately, I don't have welding capabilities, so I had to solder the cells together using a 2.5mm² copper wire from a normal NYM cable.\r\nYou'll need a very powerful soldering iron (60W+) for this process.\r\nThe battery compartment is designed to accommodate these wires, but if you use thinner wires or headframes, you might get a loose fit that needs adjustment to prevent cell movement in the housing.\r\nAt present, only "cheap" aftermarket PCBs can be used, which are also found in inexpensive aftermarket batteries.\r\nMaybe I'll try to fit a better one someday.\r\nhttps://de.aliexpress.com/item/4000307047095.html?spm=a2g0o.productlist.0.0.3927e1c0GRDLsw&algo_pvid=2ef9150a-6acc-489b-a5aa-57147ffc443a\r\nThese PCBs are not ideal, but they work.\r\nOne of the reasons Makita might not release a 21700 version is that some tools with belt clips are not compatible.\r\nI've removed the belt clip from my DDF481 tool since I don't use it.\r\nThe weights for the batteries are as follows:\r\n21700 4Ah: 470g (=118g/Ah)\r\n21700 8Ah: 880g (=110g/Ah)\r\n18650 5Ah: 636g (Makita original) (=127g/Ah)\r\nThe self-made batteries are only slightly lighter than the originals.\r\nIf you're fine with some restrictions, this solution can work for you.\r\nI've attached the STEP file for reference and modification.\r\nA 12AH version should be possible as well.\r\nPlease keep in mind that not all Makita tools are suitable for these wider batteries.\r\nI have about 15 Makita tools, most of which work fine with these batteries.\r\nHowever, some tools like the Coffee Maker DCM501 and Radio DMR 112 don't fit without modification.\r\nIf you're interested in trying this project, be aware that it's a "fun project" without any necessity to be better or useful.\r\nI've uploaded a 3-row compartment as well, but I haven't tried it in reality yet.\r\nYou'll need a second "separator" for the 3-row version, so proceed with caution.\r\n