im using EDVAN. using samsung original rechargeable battery.. which can save and less battery leakage even if u fully charged and left it for a month..

im a part time promoter of this brand before.. so i knew it.. not removeable, but after open the whole case of powerbank, it is confirmed using samsung battery.. purple colour.. samsung rechargable battery is more heavier comapre to unknown battery.. which can preserve the battery leaks.. im using 3000mah of EDVAN. where powerbank actual performance is output 60/65% of it.. it's normal.. and applied to all kinds of powerbank..

so when u buy any powerbank, u just mupltiply with 60% of the mah.. this is scientific calculation.. i just simple it for public..

I think u can get in every best buy it mall.. They are official reseller for it..

Ram 3gb is really needed in note 3. Coz u can see a lot of bloatware from Samsung in s4, ady used up 1.1gb/1.7gb ram ady.. Which is not enough.. New note 3 will use a lot of things in s pen and multitasking and new features, so 3gb is just same as other brand 2gb ram performance without bloatware.

Ram doesn't increase the speed. But it able to let user to do better in multitasking.

Of course nexus will be better coz of dont have any bloatware installed. Free ram available is a lot. Also depend on launcher of each brand.. Touchwiz, sense, sony UI, and a lot a lot..