If you're just bashing the castle creastions mamba max systems are great, i have 2 myself... but they are not roar approved as they are sensorless, you can only race with sensored systems.

li-ion and lipo are different enough that I'm not sure you want to use it for lipos... i think the charge rates are the same but the cut off might be different? don't know as I don't use li-ion in anything.