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

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Can my makita bl1830 battery be repaired if it does not hold charge anymore

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This battery has a known design defect that causes premature failure. The battery is still probably good, but the safety circuit n the battery spuriously locks it, due to a bug. Once locked, it won't charge in the Makita charger (flashing red and green lights). Makita knows about this problem but so far is not actively recalling the batteries. Makita will replace the pack if the charge count is under 150 (some people say 300?) regardless of warranty status, but you have to take or mail it to a Makita Service Center -- the dealers won't handle this unless it's in warranty.
http://www.makita.com/en-us/Modules/Service/ServiceCenters.aspx

If Makita won't fix it, you can try to repair it. If the red and green lights are flashing, the battery is probably locked and cannot be repaired in a way that will let it be charged in the Makita charger (but it can be charged in off brand chargers). Buy a clone charger on eBay for $60 and try it. If it charges, just use it, no repair needed.

Be aware that lithium batteries do lose capacity permanently at a rate of about 20% per year. So, 3-6 years is about the best battery life you can expect - from date of manufacture, so if it sat in the store a while that adds. Makita derates the cells to allow for some shelf life (down from 2400 Mah to 1500 Mah rating).

If the battery is weak, and only gives brief usage, you can replace some of or all of the cells in the battery. These are expensive and worth repairing. See this video:
http://www.youtube.com/watch?v=Z5taguEdlkY

If just 1 or 2 cells are weak, you can replace them with the same Sony 18650 size 2400 Mah capacity battery, green sleeve. The Sony's are not sold retail, and are hard to find other than from another Makita pack or from some laptop packs. If more are weak, you're better off just replacing all of them with new 18650 2400 Mah (or higher) batteries with tabs. Look for Tenergy or other quality brand.

Hope that helps.

Posted on Oct 23, 2011

  • fredianne
    fredianne May 21, 2012

    I'm a tradesman with a stack of bricked Makita BL1830/1815's. I'd like to find out how to hook up an aftermarket charger (Tenergy 01218?) . I can open the batteries, bypass the Makita control, and add a Tamiya jack (best/cheapest place to get them?) But, I'd rather just clip the alligators to the right contacts, if that's what works, and if someone can tell me which ones.
    -feldlog

  • Garry Forster Jan 05, 2014

    imax b6 will do it and tell u how many cells you have after 2 mins. should be 5 if showing lower cells need changing which is easy if you know how.

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Here is Victoria from Shenzhen - JianLin- technology. co.ltd.
We are a manufacturer specializing in battery with CE&RoHS for many years in China.(http://jianlinkeji.en.alibaba.com/product/996814627-218908870/Best_quality_makita_bl1830_18V_3Ah_Lithium_ion_battery_with_factory_price.html), we are professional for repair and rebuild Makita 18v battery,
we also make brand new BL1830 replacement battery with good price, if you interested in , please contact me at email: jlx26@j-lin-power.com Victoria
can my makita bl1830 battery - d6319b2c-e118-49a3-989e-f0718621034f.jpg

Posted on Sep 20, 2014

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Hi fredianne;




This is Sarah from Shenzhen You Tuo Jing Chuang Foreign Trade Co., Ltd, (www.yt-battery.com), we are professional for repair and rebuild Makita 18v battery,
we also make brand new BL1830 replacement battery with good price, if you interested in , please contact me at email: sarah@yt-battery.com

Posted on Sep 29, 2012

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  • Makita Master
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Go to this LINK and find the part/diagram that can help you.

Please thumbs or post back,thanks

Posted on Nov 04, 2010

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1 Answer

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The DC18RC are most likely to charged the BL1830 battery, which is the most popular of 18V Makita power tools. It is a Li-ion battery.

And the DC18RC battery charger has two volt 110 Volt and 240 Volt.

The 240 Volt DC18RC charger can replace model DC18RA & DC18SD because of its improved performance and full compatibility with Makita's NEW 'Star' labelled batteries that communicate between the tool, battery & charger. And, it is a fast charger.

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MAKITA LXT BL1830 18V LITHIUM-ION 3.0AH BATTERY


If the charge count on the batteries is under 300, Makita will replace them. Makita has a known defect in this battery that causes the battery to shut down before it is dead. So as of now they are exchanging ones with low use.

If they are truly defective and makita won't replace, you have to open them, find the dead cell or blown fuse, and replace. Search youtube makita battery for a video on repairing this battery. But once the red and green lights on the charger flash, the the battery can't be charged on a Makita charger -- it's been locked. So use a third party charger.

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