Question about Makita 14.4V Cordless Impact Driver

2 Answers

My Makita 14.4v battery charger says "defective battery" and won't charge. The pack is only about 8 months old and has very little use. When taken apart and tested, all the batteries show from .66v to .88v. I noticed what looks like 2 resistors and probably the heat sensor inside the pack. What's wrong and why won't they charge?

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  • 1gpg2 Aug 03, 2010

    These are NiMh batteries (3000 mAh) (15 of 'em). I wondered if the resistors or heat sensor could be defective

  • 1gpg2 Aug 03, 2010

    not really. I wanted to know more about the internal workings of the battery pack. Cost me $12 for basic nicad info I could have found elsewhere on the internet.

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Hello. These makita batteries have gotten low marks for durability. The batteries are shot and will not take a charge. You can go on ebay or amazon.com and buy replacement batteries if you wish to. J.

Posted on Aug 03, 2010

  • 1gpg2 Aug 03, 2010

    They are marked "Panasonic". I wonder what would happen if I by-passed the heat sensor and resistors?

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  • Master
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It's not uncommon for unused NiCd batteries to develop a memory when they aren't used much. If the batteries are salvagable you can use the following method to restore them.
1) Drain the batteries completely.
2) Freeze them completely, 24 hours is good.
3) Thaw them and let them dry from condensation completely, 24 hours.
4) Give each battery a thorough charge, at least 8 hours.
After this your batteries should work fine or they will need to be replaced. When storing your batteries it's best to take them out and use them at least every few weeks and then give them a good charge before storing them again.

Posted on Aug 03, 2010

  • 1gpg2 Aug 03, 2010

    These are NiMh batteries. I wondered if the resistors or heat sensor are defective

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