First please note the cheapest way to start is to check if your mower blades are damaged. This may cause the battery to drain faster and be the real cause of excessive battery drain. I ordered a “2 Pack – USA Mower Blades® 18-1/2″ x 1-3/4″ x 0.152, 1″ Center Hole Residential fits Black & Decker® CM1936 CM1936ZF2 SPCM1936 90541433-01″ off of ebay for $17.99. My blade needed to be replace so I figured this would be better to try first before spending money on a battery. In my case the blades were not the issue.
By this point you are probably fed up with the Black & Decker battery powered 36v mower. It is no longer cutting all of your crabgrass like it used to. Plugging in between the front and back lawn over two days isn’t the most efficient way to mow. You could buy battery complete for around $130 or you can spend a little time and take apart your battery you have now and just replace the 3 batteries that are inside the case.
The batteries that were inside my battery case were 3 Long WP12-12 12v 12ah batteries. I ended up buying a set of 3 Casil CA12120 12V 12AH batteries off of ebay for $60 total that were an exact match for the old batteries. Proceed at your own risk from this point on.
To open the battery case you only need to use a standard screw driver and remove all the screws from the bottom. 
Now the hard part is when you separate the two halves of the case be sure to note what cables go where or you will have a bad time getting this back together and could possibly pinch a wire in the process. Some of the wires sit in slits to keep the wires from being pinched by the heavy batteries. You may need to you a needle nose or screw driver to remove the plug from the terminals. The batteries with be taped together.
Copy the wiring and battery configuration with the new batteries. Be sure to tape the batteries together to minimized battery movement. Once everything is in place screw the case back together and give it a try. You may have to do a complete charge before you use it to see battery life similar to the original battery life.
Great post, and great website. Thanks for the information! Leigh Caffee
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Just opened up my CM1936 battery and found BB BP10-12 batteries. So these are 10ah. I would love to put in 12ah (for a little extra juice?) but I'm guessing I better replace with the same type of battery.
It would be great if you could add more battery but personally I wouldn't until you fully understand the functionality of the circuit board attached to it. Could be overload protection and melt the circuit the first time you use it or possibly something worse could happen. If you decide to go ahead and try it please let me know how it works out!!
Black decker lawn mower is good according to quality and cheap as well for more information you can check on Lawnmowershelp.com
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is Black and Decker CM2060C the best option or are you suggest something else.
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