Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

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How to replace batteries on CMM1000 (diagram?)

I bought new batteries for my CMM1000 and I have no idea how to replace them. Is there some sort of diagram detailing the process? The manual doesn't cover battery replacement.

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  • Sportster640 May 26, 2008

    Hi Mongodaddy,

    Thanks for your response!

    I ended up taking the mower apart the other night to see if I could do it without any instructions. It was fairly easy. The only problem I had was the strap that holds down the batteries had a broken grommet. My boyfriend made a new strap. I didn't have a Torx-type tool, but a flathead worked just fine. I also needed to borrow a nut driver from my boyfriend.

    I didn't unhook any of the wires to the circuit board, instead I just carefully set the cover to the side.

    I read on a forum about compatible batteries that can be used. The best price I found for them was from Battery Solutions Inc ($29.95 each plus about $15.00 shipping).

    UB12180: 12 volt, 18 Amp hour

    The shipping box was pretty smashed when it arrived and the batteries were packed in styrofoam peanuts (Ugh!), but they were ok.

    I had also read on that forum that replacing the batteries was really difficult. I hadn't even opened the deck to see for myself before posting the problem. It was really a piece of cake. I don't know where the "really difficult" part came in.

    The mower charged just fine and is back to it's old self!



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I have a CMM1000 which needs new batteries. I have pretty much figured out how to replace them, but I haven't found replacements yet. Please let me know where you found them! You need to remove the (black) top cover - there are 6 screws involved. 2 screws are in recesses toward the front on top. You will probably need to remove debris to access these. They are Torx type, but if you don't have Torx bits, they have a slot which works with a flat head screwdriver if you're careful.  The next 2 screws are toward the back down at either side. These are also the Torx type and they have star washers. The last 2 screws are up in the charging area. They are regular phillips and they attach to the circuit board. With all screws removed the top cover will come free. Be gentle though - there are wires from the charging meter that are still attached. You have to maneuver the cover over the height adjustment handle, then flip it up to reveal the circuit board. Disconnect the red and black wires from the terminals marked "TB2 Fuel Gauge Red" and "TB3 Fuel Gauge Blk" The top is now free and can be set aside. There is a push-fit block of styrofoam which can be removed and set aside. You should now be able  access the battery terminals which can be removed with a nut driver or socket wrench.  There is a jumper wire also. Make a note of the polarity of all connections. At this point the old batteries should slide out from their styrofoam cradle (I haven't actually tried this yet).  From this point you will reverse the steps to install your new batteries. Hope this helps.

Posted on May 25, 2008

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I ordered batteries from for a great price and they arrived quickly as promised. Thanks Sportster640.

Then I followed mongodaddy's great instructions for installing the new batteries. I have two point to add that may be of interest to others.

First, the connecting posts on the replacement batteries are different from the originals. The work just fine, but be mindful of the direction the cables are attached because when you turn the pair on its side to strap it down, if the cables aren't screwed down in the right position, it can make them too short to reach the circuit board. I had to reposition mine to make them work.

Second, the circuit board hangs off of two slots on the back of the housing. I found that it tended to droop on the front edge enough that when I replaced the mower's top, the screws that go through the top and connect to the circuit board weren't long enough to engage. My solution was to cut a 3" piece of styrofoam to prop up the left edge of the circuit board. That' exactly the same material that's already inside securing the battery, so I figured one more piece couldn't hurt. It worked like a charm and I was able to tighten all the screws.

The new battery is currently charging, but it looks like all is well and I saved more than $100 over lugging the mower to a B&D service center. Thanks for the great advice.

Posted on Aug 04, 2009

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I'm grateful to everyone who posted information on buying and installing a new battery. I ordered mine from Battery Solutions and it came in a few days. Great price! We'll see how long it lasts. I only had some problems with the two smaller white foam inserts. One fell out when I lifted the black top and don't know where it was supposed to go; and I couldn't get the second one wedged back in between the motor and the battery after I put the new batteries in. So I positioned them to support the lid and still close it - and hope that's enough! I did use double sided stick foam tape to join the two batteries together. It worked very well.

Posted on May 20, 2010

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Guy's there a recall on this mower better see service center. a board recall & upgrade lead wire recall.

Posted on May 31, 2008

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You can purchase the original black & decter batteries here:

Aftermarket batteries will not be the same quality.

Posted on Jul 07, 2009

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