A year or two ago, there were some teens (high school? college?) who were working on an E-bike project for school. On paper, it was an average build. A simple hub-motor (OK, fine, but...) it used 36V of SLA. Cheap buy-in, but,...adding a couple hundred dollars to the battery to upgrade to Lithium would last about three years, far outstripping the frequent replacement of the SLA pack over three years. They had fabricated side panels that made a cheap female-frame $100 WalMart bike look like a male-frame beach cruiser shape.
The awesome thing about it was the video they made. A guy wakes up in his room, music starts paying, he unplugs the battery pack from the charger, he carries the pack by its handle out to the bike and drops it into the top of the body panels. Then he starts to ride with lots of edit-cuts and music, waving from cute girls he passes by, etc.
I don't remember any search term that would find it.