When I bought the external battery slab people laughed at me, wondering why the hell did I buy such a monsterous piece of equipment. Well.. the battery more than proved it's worth yesterday when I was on the field doing some remote deployment testing, without having to use any power plugs or wireless hotspots. My notebook just kept on ticking for 4 hours and the slab was only down to 50% of battery capacity, for internet access I relied on the Dopod C730 to provide data connection through HSDPA... luckily Maxis did NOT let me down this time! :P