Question about Makita 2 Bl1830 18v Battery,dc18ra Charger Lxt Fr Drill

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Makita DC18RA charger conversion

Hi magua73,
I have read your messages regarding conversion of the DC18RA charger. I have the same problem, but my DC18RA charger is slightly different: the capacitor (condensator) is 1000uF, 200V. Do I need to replace it with one that has larger capacity, or just with one that is for 380V and above, with the same capacity? Of course I would also change the varistor with one rated for higher voltage.

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  • Zuluratnik Jan 10, 2009

    Thank you very much for your effort. I will reward you for this. Where did you found the capacitor? It's very hard to find one with such characteristics. The smallest one I found has diameter 35mm.

  • magua73 May 11, 2010

    Hei Zuluratnik!

    You MUST change the capacitor for one that takes at least 380v, in fact I would even say a 450v would be one safe range in case of electrical spikes. The capasitator I used was 140uF and it was ok, so it seems it is not so important as the voltage in this case.

    I hope it help.



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You can't use the same capacity as it gives you a very
large and expansive capacitor.
I used the max. diameter of 30mm that could go into the PCB of the model I have and it is 470uF 400V
You'll need to replace another capacitor, see my mod page !
This works !

I added another HowTo page for modding the DC18RA from 110V to 220V , you can find it here
all the components details are in it

Have fun and good luck

Posted on Jan 10, 2009

  • Avi Jan 10, 2009

    Hey, I found it in a local electronics supply store.

    35mm will NOT fit this PCB because of the metal heatsink and other nearby components.
    The one I used 470uF-400V is 30.6mm diameter and I had to clean
    some of the white adhesive Makita spread in this area in order to make room
    for this large capacitor.
    This capacitor is 30.6mm in diameter and is much longer ~50mm than the 35mm diameter type.
    There is no problem with components height in this area.

    Here is a sample I found on eBay

    If you want to go the safe way, you can use a lower uF value than 470uF and
    you'll get a smaller in diameter capacitor. I didn't test this but reading other modding
    pages it is said to be working as well.

    Hope this helps

  • Avi Mar 18, 2010

    Sorry to read that plimbob71
    If you reply to my mod, than
    does your PS model is: DC18RA T , P/N:
    630516A7 ?
    My mod is clearly stating it is ONLY for this model as there are few on the market.
    My page also recommend to replace 2 capacitors (not 1) and the MOSFET. You should check those as well.
    and $40 for the components ? someone is making a lot of profit from you.


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I have had a problem with replacing the large capacitor as I replaced it with a 200v unknowingly, the original was 250v! It went pop and smoke came puring out, it was a $15 cap that lasted about 1.5secs. I believe if you replace the large cap with a 400-450v 180uf-380uf and the varistor with one that will handle over 250v or something and make sure ur mosfet won't overheat, you should be fine... But I can't say just yet as I can't get another cap until after the weekend.

Posted on Aug 14, 2010

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I purchased a new capacitor, varistor, fuse and a new plug and carefully soldered in the new parts. I connected a battery and with a long extension lead stood back. As soon as i flicked the switch on a tiny puff of smoke and a small pop came from the charger. I have spent hours trying to work out what went wrong. $40 in parts and it destroyed a perfectly new battery. Big disappointment.

Posted on Aug 22, 2009

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SOURCE: MAKITACHARGER 220v to 110v problem after using of right converter

hi all,
I added another HowTo page for moding the DC18RA from 110V to 220V , you can find it here
Have fun and good luck

Posted on Jan 10, 2009

  • 232 Answers

SOURCE: where can I get a schematic diagram of Makita

go to the makita site and ask for one

Posted on Oct 16, 2009

  • 165 Answers

SOURCE: Brand new Makita DC18RA charger wont charge the batteries.

Return to store for replacement.

Posted on Feb 27, 2010

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