Question about Black & Decker String Trimmer Cordless 12" 18V

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Grass Hog Battery #243215 (12 VDC SLA) and Charger #371415-11

Both brand new and won't charge.  Purchased from DeWalt,14811 NE Airport Way, Portland, OR.  They refuse to exchange or refund!

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  • singlemommy Mar 31, 2009

    I have a battery and charger, exact same, where the green light stays on saying the battery is charged, but the battery is not and it won't run the weed eater. Not sure if it is the charger or the battery. Can't get it to work either.

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Open the unit up (six cross-head screws). Inside you'll find a 12V 5.0AH rechargeable battery, like the kind used in many home alarm systems.
You can get a replacement at most battery stores (they'll even pre-charge it for you). Somewhere around $20, I guess.

Posted on May 28, 2009

  • skibikefun Apr 20, 2011

    Thank you so much for this suggestion! I hadn't used my weedeater in 6 years. I followed your directions and it works like it is brand new!!!

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I need to find a battery for my black and decker grass hog. The battery I need is 12 VDC Battery part number 243215!!!!

Posted on Jul 31, 2010

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Someone gave me one and it was having the same problem. I solved it by using a piece of fine sandpaper to resore the surface around the outside of the prong that plugs into the tool. Now it charges!

Posted on Oct 24, 2009

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The screws are unbelievably hard to unscrew -- when I try, the ones that work (2 of the 6) make a loud pop and then begin to come out. The other 4 are no go so far. I've tried a number of different Phillips head screwdrivers, both me and my husband (and both of us). Is this usual? Thanks

Posted on May 03, 2012

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I have a lot of chargers but not one for the Weed Trimmer.
Grass Hog Battery #243215 (12 VDC SLA) and Charger #371415-11Is there somewhere I can get the breakdown as to the volts, wattage, etc. that I can use to see if I have one that will work?

Posted on Feb 10, 2010

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You have to charged the unit for at least 16hrs as recommended.
is the unit is not running at all.

Posted on Jun 16, 2008

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If the trimmer charges at all but not for a very long time, it's either the charger or the battery. Check the charger when it's charging to make sure the red light stays on -- if it goes off or blinks, you need a new charger. If the charger light stays on but the battery doesn't hold a charge, you need a new battery.

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