Friday 26 July 2013

Getting the Modified batteries to work on the tools!

Ok so I had one oversight in the battery modifications... The newer tools require the 3rd pin on the tool that is switched by the onboard chip and has to have voltage on it to enable the tool to be switched.  This is done so the tool is electrically isolated when the batteries parameters such as over current, temperature and under voltage.  

So as I have modified the batteries without using the onboard chip but the batteries fail to work in these tools! 

There were multiple solutions to this!

Solution #1

The first solution was to link the Positive rail and the control pin so that there is voltage on the pin so it will work in the tool.  The only problem in my case was some of the chips had the small pin and still did not work as they were not making connection!

Solution #2

Modifying the tool. This was something i didn't want to do but in the end became the easier method. Because i had several batteries that had the older style board with the shorter control pin it seemed to be the logical method.  However i will look into fixing the board so that my batteries will work in everyone's tools not just my own modified ones.

This picture shows the modification of the tool.



Posted by at

24 comments:

  1. Matthias8 November 2013 at 07:57

    This comment has been removed by the author.

    ReplyDelete
  2. Matthias24 November 2013 at 02:34

    Hi,
    well done and thought out.

    I had a slightly different approach to buy a RC lipo battery + charger for about 70 euros and buy the makita 456 for another 65 euros:
    this is the somehow funny looking result:

    http://postimg.org/image/4mxuixr1n/
    http://postimg.org/image/5y10dnx9n/

    ReplyDelete
  3. Unknown10 February 2014 at 13:16

    Broke the yellow plastic covering the 7 pins which are now bent and twisted. Is this possible to replace?

    ReplyDelete
  4. Unknown2 April 2014 at 08:11

    Hi I can supply these chip sets if you are still interested

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  5. Unknown14 April 2014 at 02:57

    Great Article.
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  6. Unknown30 April 2014 at 20:22

    Well explained. If ever I have a trouble with My own batteries I'd like to try this without asking My technician.

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    I will remember to bookmark your blog and will come back down the road.Makita

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    I thinkg makita cordless tools is much better than other power tools

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  10. Unknown6 May 2015 at 15:20

    Makita hp457 d have 3 contact pins on the body.and 5 pins on the battery. How it's going to be charged? Batt have 5 cells .

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  14. Unknown28 September 2018 at 13:19

    Ryan i have problem becouse the new brushless tools need the third pin to run correct i will chec but i have one new battery and the bldc impact wrench dtw285 work good, but when i connect the battery old one, where i charge cells individual and the overall voltage is 20v the impact wrech dont work corectly the led light on but the wrech rotate very very slow and it hase step moves.

    What do u think about this ?

    ReplyDelete
    Replies
    1. SMarjeta5 April 2019 at 05:19

      Same here. Older Makita drill accepts all batteries, but my new brushless impact driver only lights up and give minimum power to rotation. I'm no sure about what is happening, but I think it is related to the start protection system. Unless tool gives ok signal to battery (or vice versa), system will limit the tool to protect battery from overdraining.

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