No removable battery sucks
So does a lack of a physical keyboard in landscape, but there are no Android options for current phones, on that one.
3KmAH isn't that bad, but it is never guaranteed the phone will survive an entire day, or - shock! you may wish to be away from power for a couple of days/forget to plug it in overnight. External battery packs suck. It's vastly less convenient than using spare batteries, together with an external battery charger.
On my 'new' phone, a Motorola Photon Q (2012 Android keyboard phone), it doesn't have a removable battery either (I had no choice, it's the latest *landscape* Android keyboard phone there is). This means I'm going to be modding it to accept a removable, larger battery. Words cannot describe the joy I have at the risk of ruining the phone/battery with a slip of a soldering iron/glue, or the hassle of creating a piece of plastic with appropriate metal prongs to adjust the phone to accept an unmodified LG battery.