Good on you at least you tried.
Yes GM products are designed to work well with GM products and when we mix and match some 20/20 hind sight would be great.
My theory about the differences between why SLA batteries look like they gona work, and it will work goes down the IMO density of lead. It becomes its own animal holding inertia. Big or small its lead. Probably why they make good bullets. And the brakes need to be top notch. You need to be able stop faster than a car and your into safer waters when on the road.
I think your first attempt of the hybrid mix and match was very well done and hope you continue to do more here. The information with your review was, and is very important to many future Ebiker's who come here.
Happy holiday to you too.