Oh, well that's different then. I would be interested in a 2-3000mah power bank like that, depending on cost.I could have been more precise, it's a dedicated power bank, for now it's a concept proposal, but with an announcement of production, but your development of this project with BT is worth attention
This power bank is designed to connect specifically to this FiiO model, for others, such as ibasso DC Elite, connecting to USB is not entirely convenient.
I think this may also set a direction for ibasso engineers.
That's not a problem, it would be a simple case change to make it "L" shaped to fit USB C dongle DACs if the USB socket on the end.
For example, a front or rear battery with a dedicated leather case, or even a simple leather band with 3.5, 4.4 holes and a quick latch. This would avoid blocking access to the diode and function button.
OK, but these are just loose ideasJust my 2c. The whole point of usb dac dongle is to have a small device to enhance the audio quality of your source like a smartphone. The idea of DC Elite is to maximize this enhancement in the smallest allowable footprint. Adding Bluetooth functionality means adding internal battery, power filtering, and other chips, making it bigger and bulkier. And, CB19 gives you an option to use any external power bank. I can guarantee, if iBasso going to come up with a piggyback battery module, there will be a ton of complaints that capacity is not high enough or it creates some interference, etc.
At this point, just keep DC Elite as is, use CB19 for convenience if you want to, and let some 3rd party to come up with a solution
. I mainly had in mind a dedicated power bank (not BT). I use a medium-sized DAP as an audio transport, which for me cannot compete with dc elite. I'm not the only one looking for a solution that will retain the features of a compact and ergonomic solution in such a combination.
. For me this is the project of the year or even more. Howgh! 
I recently got this battery:
Bits are bits and there is no difference has been stated over the years. But there are differences. Timing of the signal that is received that is from the source. This has been a debated since CDs came out and a little before as digital took off. Then there is also the DC power to the DC-Elite or any dongle. How clean is it does it deliver current on demand or does it decrease it some. That is where a powerbank may help or not, depending upon your source. There are so many variables.
I have several smartphones and the hiby application in beta version, which works without lag in exclusive mode (bit perfect), unlike the official application from the Google store. Although it sounds great with a DC Elite smartphone, I always choose DAP as an audio transport. I have a hiby R6 2020 (I really like sound personalization and this DAP offers really great possibilities). I can't say exactly what it is, maybe it's just a psychoacoustic illusion, or maybe it's a matter of engineering and optimization of HIFI devices. To my ears, this combo sounds definitely the best. I can confidently say that the precision is greater than with a computer, which up to a certain point I considered the best audio transport (with EQ APO app). At the end of the day, you will still make your own choice, which one you think is best. I wish you fruitful discoveries in the audio world.
