I'm not sure what to tell you... Why do you feel you need to upgrade to Spinner 2? Capacity? Yes, Spinner 2 will last longer (1600mAh), but it's also much bigger and heavier than what you have already.
If you're looking for a larger capacity battery, may I suggest MVP2? It's box-shaped, but if comes with 2600mAh capacity, vv/vw, ohms reader, can be used as a pass
through--and it will charge your cell phone....
