I purchased the Tekkeon myPower All MP3450 external battery and the Booq Mamba XS messenger bag and received both over the last two days. Initial impressions are favorable. In fact I am typing this post at a Starbucks with my Acer C110 connected to the MP3450 and I brought all of my gear in the Mamba XS.
When I was posting earlier about the MP3450, I was concerned that the battery would not charge my Acer internal battery. Fortunately that is not the case. Right now my Acer is indicating that it is 'plugged in' and has been at 100% battery level for the last 30 minutes that I have been 'plugged in'. So good news there. It was important to me because at times I know I won't want to have the MP3450 connected to the Acer any longer than needed. Right now its not a big deal. I am sitting at a table with the MP3450 placed on the table right next to the Acer. However if I am walking round and have the tablet in slate mode it would be easier to not have to be tethered to another device, even though it is small and lightweight (< 1 lb). And if the MP 3450 didn't recharge the internal battery I would be limited to the time without the MP3450 to the lifetime of the internal battery which is about 2 hours.
I also like that it has a 5V USB outlet which allows me to easily charge my phone (Moto Q) and my Ipod Nano. The power cord connecting the MP3450 to the Acer is coiled which I also like. Its easier to store and less clutter when in use. Nice touch Tekkeon! Its also a nice looking design. So nice that I would hate to scratch it up so its good that the battery comes with a protective pouch with a plastic window over the indicator lights and voltage selector button.
The Mamba XS seemed smaller than I thought when I took it out of the box. Which is nice since its a smaller foot print when carrying but my concern was that it wouldn't be big enough to carry all of my gear. So I emptied my Case Logic case that I have been using for 3 years now and packed the Mamba XS only to find I had room to spare. Which was good since for this trip I was also bringing the MP3450 battery and a notebook for the writing workshop I will be attending today.
I also like the easy access pouch at the top which is where I will keep my iPod and I like the 'pockets' under the flap which nicely fit items I want to easily get at without the concern of those items falling out. One thing I think I will miss is the zippered compartment in the back of my Case Logic bag It was only wide enough for documents or magazines but it was a good place for those items without cluttering the main compartments.
I'll write more after a few days of use.