Makita DC18RA charger conversion to 220VAC

by Updated: Nov 11, 2020diy-miscellaneous6 comments

DC18RA T conversion 

How to convert Makita charger to 220VAC

This guide relates ONLY to Makita model DC18RA T P/N: 630516A7

Please don’t ask about other models as no  answer will be given, sorry.

How did I convert Makita DC18RA T charger from 110VAC to 220VAC / 240VAC mains ?
How did I make a US / American Makita charger to work in European countries ?
How did I mod (modify) Makita DC18RA T charger from 110VAC to 220-240VAC ?

DISCLAIMER – Important!

exclaim2 Please note:

1. exclaim2 There are few PCB models for the same DC18RA charger.
This page relates ONLY to the PCB model shown in the following images which is of Makita DC18RA T , P/N: 630516A7 

2. exclaim2 I have received several comments that described same model # but with different design and components.
Please beware that this mod might not work on your charger or worst, will damage it.
Only perform this mod if you know your way around with electronics !

3. exclaim2 I got a genuine 220V DC18RA-T charger P/N:630508-6 to compare
(see image) This charger has more changes from my mod.
Due to this, please consider if you are willing to take the chance.

DC18RA T charger is for charging the following batteries:
– Makita Li-ion batteries type BL1815, BL1430/A, BL1830
– Makita various Ni-MH batteries (see charger manual)
Makita DC18RA T charger – general view
In order to mod this charger, you’ll need to:
A. Disassemble the PCB from the housing

Exploded view of Makita DC18RA T
disassemble only parts that are colored with green

B. Replace components (2 capacitors, varistor + MOSFET (*)
Needed components:

 1. Electrolytic capacitor 470µF 400V with Max. diameter of 30mm. Lower µF value will probably be OK too, you’ll find it with smaller diameter and cheaper. I got a report from Sweden saying this mod works OK with 150µF 400V.
exclaim2 Note: Take extra care to capacitor polarity when you place it.

2. Varistor 14D361K , VMax=360 Imax=6000
exclaim2 Note:
– original varistor is covered with a black shrink, remove it first.
– after replacement, it is advised to add the shrink to avoid damage in case of blow

3. Electrolytic capacitor 22µF 450V (or 400V) with Max. diameter of 13mm
exclaim2 Note: Take extra care to capacitor polarity when you place it.

4. (*) MOSFET 2SK3679 (with 900V Vds)
This component is located near the varistor and is attached to the heat-sink. This was reported in a Norwegian forum which says the MOSFET also needs to be replaced to have 900Vds. Users reported that 220V Makita charger uses MOSFET 2SK3679 while 110V version uses either 2SK3528 or 2SK3683. It was also reported this part is costly and that in cases of moded chargers that didn’t replace this part, all works OK, (including mine with 2SK3683). So, my advise for you is to check your charger MOSFET and decide if you want to go safe and replace it as well, or take the risk did-you-find_gifanim.
exclaim2 Note:
– If you can’t find 2SK3679, its direct replacement is: STF9NK90Z
– This MOSFET needs a thermal compound when attaching it to the heatsink. It is advised to replace old compound with fresh one when you replace it.

5. Ceramic Fuse 6.3A 250V In case you blew the unit did-you-find_gifanim you’ll probably need to replace this fuse as well.

6. Mains Plug For safer and secure operation, cut the US plug and add a mains plug according to the standard used in your country. The US supplied wire comes without earth wire so you don’t need to worry of it.

Makita DC18RA T PCB before the mod
Makita DC18RA T PCB after the mod
In case you also replace the MOSFET, here is an image to show its location
C. Assemble the PCB to the housing, make sure the battery contacts module is in place with its spring
To complete this page, here are the panel indicators modes
This is a genuine 220V DC18RA-T P/N:630508-6.
exclaim2 Compare it to yours!
Voila – you now have a working 220-240VAC Makita DC18RA T charger.
Have fun and enjoy your Makita tools, Avi clapup_gifanim

For more How-To guides by Avi, Visit the main DIY page

You might find there useful guides such as :

Fixing Grohe flush system
12V Burnt LED bulb fix
How to repair LG refrigerator water leakage?

and more…

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  1. Paulo F.

    Hi, great tutorial!
    After the conversion this charger will be able to work also in 110V or only 220V?

    • Avi Schneor

      220V ONLY!
      Conversion means one way change.
      You will not be able to use it on 110V

  2. Johnny

    Interesting. Fond this when if need to repair a charger. Did you glue the new components to the board? What type of glue?

    • Avi Schneor

      Thanks for your question.
      NO glue, all replaced components are through-hole and soldering was used with regular solder wire and flux.
      Good luck

      • Dalyn K.

        Hi, I have a DC18RA S and the circuit board is completely different,do you have any idea what I need to do to switch it to 220v?

        • Avi Schneor

          I’m sorry but no, I have no idea of it.
          Please be warned that this post relates ONLY to model DC18RA-T, P/N: 630516A7
          Good luck


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1. This product contains electronics and/or electric parts.

Any modification made to your product may cause damage to your equipment and harm to yourself or to others. 
Any modification made to your product AND/OR to a 3rd party attached accessories will void manufacturer warranty.
None of the following steps is recommended by me nor by the manufacturer. 
This post show only my personal experience and know-how.
If you follow any of the steps, you do it on your own risk and responsibility.

2. Copyright © 2003 Avi. All rights reserved. 

Content including all text and images in part or in whole may not be reproduced, retransmitted, stored, distributed, disseminated, sold, published, broadcast or circulated in any medium
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