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Makita - Activ Energy (Ferrex) 18v battery adapter

Creation's quality: 5.0/5 (1 vote)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

This is a battery adapter that allows for using an "Activ Energy" (Ferrex) battery on Makita 18v machines.


Activ Energy (Ferrex) 18v batteries are less than 1/2 the price of a Makita battery with equivalent capacity. Ferrex use samsung cells, so the quality is also reasonable.
e.g. Ferrex 18v 2Ah: 15€ on Amazon vs. Makita 18v 2Ah: 35-40€


The Activ Energy battery is rated with 20V (max). Actually this is misleading, because thats the max. initial voltage. Usually, Li-Ion Cells per definition have a nominal voltage of 3.6V. Thus 3.6V x 5 cells = 18V, which is also true for the Activ Energy battery.

Additional parts needed:

  • 4pc 3x15mm screws
  • 0.8-1mm metal sheet for the two conductors

Making the conductors:

Cut the metal sheet according to the dimensions in the figure. You may use a Dremel or CNC cutter, etc. Use a vise and hammer to bend the pieces. On the Makita-side of the adapter, I bent a slight kink into the contacts to ensure a reliable electrical connection.


  • LiIon-Batteries are delicate and potentially dangerous parts. Use the battery adapter at your own risk!
  • Use an Activ Energy charger for charging the Activ Energy battery!
  • The adapter is not accounting for any battery management happening between machine and battery!
  • Akimakes cannot be held responsible for any consequences arising from using the adapter.
  • The adapter was tested on the Makita vaccum cleaner only, where it worked flawlessly. Not tested on other Makita machines.

3D printer file information

  • 3D design format: STL Folder details Close
    • ferrex_side.stl
    • makita_side.stl
  • Publication date: 2020/10/12 at 10:37





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