I bought an Acer Switch Alpha 12 last summer and really like it.  The only issue is that the battery life is very limited.  I will be traveling for a couple of weeks and not have access to plug it very often during my travels.  What would be the best way to increase my usability?  Should I buy an external power source or an extra battery for the unit?  If I buy an external power source, what kind is recommended?  If I go the battery route, I have no idea how to take out the current one and replace it!  THANKS.