charging up is slow

[stevenrossvanduyn]

I have noticed the surface pro 2 is the quickest to charge up, then comes the surface pro followed by surface pro 3.
Any ideas why its soooooo sloooow to charge up

 

[Jesse San Nicolas]

Off the top of my head, I suspect the SP3's weakened 36-watt charger is no match for the SP2's and SP1's monster 48-watt charger.