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  • Lithium upgrade to 18v Black and Decker Single Source battery pack

    I just made one of these. Used good, high quality battery holders and ensured the wire gauge was more than adequate. I bought batteries similar to what you described (over voltage/current protection) With no load, voltage is right at 24VDC. When I tested on the trimmer, as soon as the load increased (like when trimming heavy grass), the power dropped considerably, to where it was inadequate for trimming. I could pull the battery out and see the voltage coming back up (from around 22VDC by the time I got it out). The batteries were warm, but not hot. Anybody had any issues using this with your trimmer? I did try replacing 4 of the cells with standard (no protection) 18650 batteries, but same result. Unfortunately, I don't have 6 to try. Could this be an issue with current protection kick...see more »I just made one of these. Used good, high quality battery holders and ensured the wire gauge was more than adequate. I bought batteries similar to what you described (over voltage/current protection) With no load, voltage is right at 24VDC. When I tested on the trimmer, as soon as the load increased (like when trimming heavy grass), the power dropped considerably, to where it was inadequate for trimming. I could pull the battery out and see the voltage coming back up (from around 22VDC by the time I got it out). The batteries were warm, but not hot. Anybody had any issues using this with your trimmer? I did try replacing 4 of the cells with standard (no protection) 18650 batteries, but same result. Unfortunately, I don't have 6 to try. Could this be an issue with current protection kicking in on the batteries?Thanks!!!

    Thanks for the info. I have the UltraFire BRC 18650 4500mAh, looks like the same you linked to. From what I can find on the net, they are definitely a lower current battery. I am having trouble finding "C" ratings for specific batteries, but can back it our based on the formula (C = mAh*MaxCurrent). I am seeing some higher end LG and Sony 18650 batteries with ~30A max draw. Would these be adequate? What do you use for your trimmer, and how does it compare with original nicd? Thanks!!!

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