Battery management is handled by the power tool in which they are designed to be used. I imagine a circuit to power a 48V e-bike with power tool batteries is possible but I'm not familiar with specifics.Īnother thing to keep in mind is this: I was told by DeWalt that these lithium power tool batteries do NOT have a BMS or low voltage cutoff circuit built in. I have seen two 18V power tool batteries used in series in a scheme similar to this to power an e-bike with a 36V system. If your bike uses a 36 or 48 volt battery, be aware that this scheme may cause damage to the bike components. In this case, the overage isn't significant enough to cause damage. The actual output of the DeWalt Flex Volt battery is 61.2V which is a bit higher than the 58.8V of the OEM bike battery. Please note this scheme is for an e-bike that uses a 52V battery and is equipped with a controller rated for at least 60V. The switch lets you choose which battery is to be used. Wire a double pole double throw switch as shown: Here are a few crude over simplified drawings that might help:įirst, you need to access the wiring between the battery and controller:Ĭut the positive & negative leads (usually red & black) I'm curious how others who use them handle battery management.Ĭlick to expand.Unfortunately, a schematic for wiring up a rig like this will vary depending on the e-bike you have. Using power tool batteries on an e-bike is nothing new and the idea has been discussed here before. I also don't know whether the low voltage cutoff circuit is located in the tool or the battery itself.Īt $250 each, I don't want to damage the battery by over discharging but I also want to get the maximum range possible. I don't know how the voltage relates to the actual % of charge and, more importantly, what the safe max discharge voltage is. I don't know what type of cells are used however and the voltage does not match that of "standard" lithium cells. Very little information is available for these DeWalt Flex Volt batteries except that they use 3 strings of 5 cells wired in series for 60V or parallel for 20V. Consequently, I'm using a voltmeter to determine the battery state of charge. It does not cause any issues with the controller other than an inaccurate battery gauge reading on the display. The fully charged voltage of the DeWalt battery is 61.2V which is higher than the 58.8V for the OEM. With three speeds for excellent handling and control plus three LED lights with a 20-second time gap after hitting the trigger release, this amazing tool is ideal when working in the winter or in poor light.The bike uses a 52V battery with a controller rated at 61V. The DeWalt XR 18v Lithium Ion Brushless Impact Driver is another great model. The dust blower and extraction system not only clears dust and debris from the cutting line, it also reduces airborne dust so makes for a healthier working atmosphere. Lightweight, compact, and very easy to handle, this DeWalt circular saw can cut to a depth of 65 mm and proudly boasts a stunningly high powered 1350 Watt motor for fantastic cutting performance. When it comes to heavy duty cutting jobs, the Dewalt DWE560 Circular Saw is ideal. The Li-Ion battery delivers a long run time and the cordless design means you aren't tripping over cables on site, making this model a great addition to your kit. To really get the job done, try a DeWalt 18v Li-Ion Brushless Compact Hammer Drill, with brushless motor technology and a compact, lightweight design to make it extremely effective, even in confined spaces. With their wide range including, drills, rotary and demolition hammers, fastening tools, sanders, saws, and grinders, as well as many others, DeWalt remains an industry leader in producing high-quality, powerful tools that are trusted by professionals. DeWalt invented the first radial arm saw in the 1920s, the DeWalt brand has been at the forefront of innovation. So whether you require something light and portable or heavy duty, strong, and powerful, look no further than the huge range of DeWalt power tools and accessories in this range. DeWalt power tools are synonymous with high quality, top performance, and ultra reliability.įounded almost 100 years ago in 1924, DeWalt products are engineered for both domestic and industrial use, using the latest advances in technology.
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