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Is there anyway 2 recharge/repair an 18v battery

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Not really, batteries have a life span and are made of multipal cells. If one goes bad the battery will not work, even if it the bad cell was replaced the others will be short behind. As each one is a special design, you cannot obtain them or even be able to test the old ones to know which are bad, just not worth it, ok!

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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18v battery for nutool cordless drill


How To fix: Zap a Dead Cordless Drill Battery (nicad repair ...

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1 Answer

18v lith ion Battery charger 12v makita will not charge battery? why? why?


I also have the same dilemma,and of course,it occured 1MONTH after 1year warranty expired.I know my batts r still fine,as I recharge em on my foremans kit.
My charger plays a tune,then just blinks red,green....etc.Wish I had some tips to try,from an electronics brain-type person.......lol,good luck::

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1 Answer

This Makita 18v rechargeable flashlight got wet and now won't work. Can I send it in for repair or what do you suggest?


It's a simple enough setup, with a battery(18v), a globe(18v), a switch, and for some reason a circuit board with do-hickeys on it. I bypassed the circuit board and it then worked fine, but you may want to trouble shoot a bit.

-check for voltage in the globe holder

take it apart. use a multimeter on its beep setting.
-connect to either side of the switch and see if it works
-connect the battery and see if you get voltage across the pivot contacts.

see my solution here for how to dissemble, and how to bypass the circuit board
http://www.fixya.com/support/t15194423-remove_case_head_from_makita_bml185w

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1 Answer

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I did get an educated electronics eng. tell me li ion batteries 4handtools,are manufactured to only be recharged a set number of times,to avoid tool damage.

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1 Answer

Need to know what terminals to conncect a 12v charging system to a Dewalt 18v battery in order to recharge it. I know it is a three prong system and I am assuming that the small center ground is used for...


I do not recommend connecting anything but the factor charger to the battery. No 12v will not not charge an 18v battery.
They can BLOW UP if you apply too much current.
The correct charger can be found cheap. Look on craigs list under tools.
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2 Answers

I get a green and yellow light on the Ryobi 18v charger and the batteries don't recharge. Does this mean the charger is now bad? Thanks for any help. Dan


This usually indicates that one or more of the rechargeable C batteries is not recharging. The batteries are standard rechargeable C batteries but the terminals are spot welded and are very hard to separate. There are 15 rechargeable C batteries in the Ryobi 18v battery pack. A battery tester will show which battery(s) needs replacing. There are refurbishing centers (Google search) but they will replace all the batteries and usually upgrade the OEM 1500 mah batteries with 2100 mah, or higher, batteries.

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For NiCd and NiMH batteries - check the battery voltage (for a good battery it is ~ 19, V); each battery contains 15 units 1.2 V each; you can test each unit after disassembling the battery case (my have 4 screws each, and the case has bottom and top parts). First charge the batteries; second, disassemble cases and check each unit voltage (shouldn't be less than 1.2 V); then take any battery tester (for AA, AAA and other batteries and accus for home usage), attach 2 long (~10 inches) wires to tester's testing contacts, and test each 1.2V unit for current - if it is in "yellow" or "red" zone - the unit is dead and needs replacement

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1 Answer

Makita cordless driver drill model-6347d. ni-mh rechargeable nickel metal hydride battery 1834 18v 2.6ah will not stay charged. battery charter dc 1804- works great.


You say will not stay charged? Over what time period? Are you aware Nicad and NiMh rechargeables discharge naturally at 1% per day so where does that leave your power tool after 3 months? Furthermore they only have around 1000 charges in their useful life so you can immediately see how these tools are not for intermittent(ie handyman) use.

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