Note, we have not tested this option, but have heard positive results from Groove owners that have tried this...

Eunorau uses a similar battery on their E-Fat_MN and E-Fat-Step models as we use on the Groove. We have heard that their battery cradle uses a 2 pronged connector where we use a 4 prong connector. So if you are looking to replace your Groove battery with one from Eunorau, then make sure to order a new frame connector (battery cradle) from them at the same time.