Question about Makita BL1815-2 18 Volt 1.5 Ah Compact Lithium-Ion Battery - 2 Pack

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The Makita BL1815 battery will not charge, lights flash red/green, indicating bad battery. I replaced one open cell with known good cell, charger still reads bad battery although I can charge from an alternate source when bypassing the too-smart circuit board. Can a bad battery message stored in memory in an I/C on circuit board be reset? Thanks, Tim A

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kbert1171

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Tried it a few times. got the charge up to around 13.9 and it still wont charge. i dont understand, because the battery isnt that old to begin with. thanks for the suggestion.

Posted on Oct 12, 2014

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Anonymous

SOURCE: makita dc1804f charger will not charge new i-mh 1834 18v battery

I think your tryiong to charge NIMH batteries oon a charger designed for Lithium Ion batteries. With all the new style batteries such as NICAD, NIMH and LI-ION, charging becomes difficult. Most chargers pre NIMH and LI-ion, were designed for NICAD's. The best advise, match your batteries with the correct charger

Posted on May 23, 2008

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SOURCE: Battery Issues

When Li-Ion batteries are discharged to a too low voltage (below 2,75 V/cell, in this case 13,75V) the charger will assume that the battery is damaged, and will not charge the battery. First measure the battery voltage with a volt meter, if the voltage is significally below the 13 V the battery are no good. If you have a reading of lets say around 10 V, you can raise the voltage shortly on the battery, by jumping it with a fully charged battery. Connect the "-" poles on each battery. After this, shortly connect the "+" poles, for no more than 5 seconds,disconnect the wires and immediatly put the battery in question in the charger. If it starts charging, every thing if fine. If not, try the process again, you might wanna recheck the voltage if it rises.
Please be aware, that over discharging Li-Ion batteries, will lead to damage of the Li-Ion cells, which results in loss in capacity, therefore, if you are not to use your Li-Ion tools for a while, make sure the batteries are fully charged.

Hope you guys could have sucess with the above

Best regards
Soeren

Posted on Jun 28, 2008

Avi

  • 66 Answers

SOURCE: MAKITA LXT BATTERY CHARGER

hey
flashing orange=cooling abnormality.
you need to wait for the battery to cool.

see my mod page, it has all light explanations in it.
Have fun
Avi

Posted on Jan 10, 2009

Robert Koch

  • 165 Answers

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

Return to store for replacement.

Posted on Feb 27, 2010

al_kupchella

Al Kupchella

  • 843 Answers

SOURCE: When putting the battery in

Have you tried just waiting a few minutes, it might start to charge anyway. But if not, is there some reason you would assume that you don't have a bad battery? There are lots of bad Li-Ion batteries.

Posted on Sep 03, 2010

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Greetings Gurus. I have Makita charger model DC18RC, battery model is 18v BL1815...manual is of limited help. I'm trying to understand what the indicator lights mean, what the time is for charging,


I agree that the pictographs are not very helpful. You probably have one of the new chargers. I have an old one, which is a little easier to figure out.

From top to bottom

1. The flashing green light with the electric plug indicates that the unit is plugged in and ready to go.
2. The flashing red little fan means that the battery is too warm so it is just cooling it and not charging it at that moment.
3. The solid red empty battery outline means that it is charging but hasn't got very far, less than 80% full.
4. The mostly full battery outline with both solid red and green lights at the same time means it is 80% full or more
5. The full battery outline and solid green with the musical notes means it is full up.
6. The broken battery outline with flashing red and green means you've got a broken battery.
7. The yellow light with the wrench means the charger is "conditioning" the battery, whatever that means.
8. The yellow light with the fan means "cooling abnormality."

Hope this helps

Nov 01, 2014 | Drills

1 Answer

Makita bl1830 charges but stays on static red light


Chargers have been known to lie about what they are indicating. Even though you say the batteries were charged only a hanful of times, they may, in fact, have expired

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1 Answer

Makita battery charger wont charge


If both lights on the charger are flashing it is indicating you have a bad battery and the charger will not charge the battery. The charger has circuitry that tests the battery and if it 'thinks' the battery is defective it will not attempt to charge it. The only way to verify whether it's the battery or charger is to try charging your battery on another charger or try charging another battery on your charger. Most of the time it's a bad battery.

Aug 02, 2012 | Makita DC18RAX230 230-Volt LXT Lithium-Ion...

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My dc18ra makita battery charger flashes red and green lights no matter how many bateries i try


The pcb inside the battery has a microcontroller that monitor the charges and charge cycle. When the cell falls below a certain voltage, it will instruct the charger not to charge and will show with a red-green flashing light. If the battery has been tried 3 times in succession then the pcb will brick itself from the makita charger. So first replace the bad cells. There are 2 solutions at this moment: charge with a 3rd party lithium charger like the imax b6 or replace the pcb with a working one. check out my blog on http://mkbl1830.blogspot.com/

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1 Answer

Red and green flashing lights on 18v lxt charger


Batteries don't always look degraded but if they've been in use for a while or have a bad cell, they will show up bad on the charger and it won't charge them. The only way to test the batteries is to try to charge them on another charger. If the batteries show defective on another charger, they are bad and you'll have to replace them. Also try to charge some batteries you know to be good on your charger to see if it's the problem. If your batteries charge on another charger, your current charger is bad and they don't have any replaceable parts in them so you'd be looking at replacing it.

Feb 21, 2012 | Makita Tools & Hardware - Others

1 Answer

When putting the battery in the charger the red and green lights flash indicating a bad battery, cannot charge battery.


Have you tried just waiting a few minutes, it might start to charge anyway. But if not, is there some reason you would assume that you don't have a bad battery? There are lots of bad Li-Ion batteries.

Sep 03, 2010 | Makita BL1815-2 18 Volt 1.5 Ah Compact...

3 Answers

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.

Apr 18, 2010 | Makita 2 Bl1830 18v Battery,dc18ra Charger...

3 Answers

When put on charge the green and red light flash


Yep, not the batteries, mine is doing the same thing but my second charger works fine with the same batteries

Jan 19, 2010 | Makita 2 Bl1830 18v Battery,dc18ra Charger...

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