Battery adapter for dewalt series#

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. The bike uses a 52V battery with a controller rated at 61V.

Battery adapter for dewalt