There was one website I visited a few years back that had virtually any size lipo and configuration you wanted. I found them by looking for a tiny 3.7v 75mah lipo. I didn't order anything from them, otherwise I would have a record of it. But they also stated if they didn't have it, they could make any configuration and size you wanted. And if there is a minimum order, maybe a co-op is in order. As I have 17 boards here that could run from 3.7v lipos. 