By now, the process of creating custom lithium-ion battery packs is well-known enough to be within the reach of most makers. But it’s not a path without hazard, and mistakes with battery protection and management can be costly. Happily for those who are apprehensive on the battery front there’s a solution courtesy of a group of engineering students from the University of Pittsburgh. Their project was to convert a pedal bicycle to electric assisted power, and in doing so they didn’t make their own pack but instead used off-the-shelf 40V Ryobi power tool packs.
The bike conversion is relatively conventional with the crank replaced by a crank and motor assembly, and a pair of the Ryobi packs in 3D-printed holders on the frame. The value in this is in its reminder that these packs have evolved to the point at which they make a viable alternative to a much more expensive bike-specific pack, and that their inclusion of all the balancing and protection circuitry make them also a much safer option than building your own pack. The benefits of this are immense as they bring a good-quality conversion within reach of many more bicycle owners, with all parts being only a simple online order away. Take a look at the video below the break for more details.
Those Ryobi cells certainly seem to have carved themselves a niche in our community!