I’ve been after a power bank for a while now but have been put off by a couple of things, firstly I want one to power my Osmo action or Osmo pocket while doing long time-lapse and to charge the Pocket in-between using it when out for the day. I dont fully understand the technical talk on the usb output 1A, 2A, 3A and what effect it would have on the Osmo’s. I’m I right in thinking no matter what power bank I got the device plugged into it would only draw the charge current it needed or am I wrong and plugging an Osmo into a 3A port would damage it? Also I would like to charge my phone (Samsung S20) which can charge at 25w so would a PD power bank charge everything or kill everything? Sorry if this makes you think WTF, I know what I mean I just hope you lot do!
Correct!
Basically
- if the powerbank’s port can support the gadget’s needs or more - it will supply it with what it needs.
- if the gadget requires more than the port provides, it just charges more slowly.
There are no dangers in that respect.
Also - consider Anker powerbanks. They are excellent - and have been for the many years I’ve had them.
I use a biggie on my Pansonic G9 for 5 hour time-lapses, impossible with the default battery. And at the end … the camera’s battery is also fully charged for whatever is next. 
I use an Anker 20100 mah power bank. Been an excellent piece of kit. Still going strong after three years. Get around 5 full charges of an iPhone 8plus.
Which is where I am right now … and guess what I forgot to recharge!
Not sure how far through this comet time-lapse I’ll get.
(A bit fuzzy on the phone photo of G9 screen because the review is only visible for 1 sec to check exposure … and save camera battery. 
)
Hi
I use a RAVPower 13400mAh power bank, I have had for 3 or 4 years now and it is excellent, at the time it was considered one of the best power banks. I has two output sockets, one is a 5v/2A and the other is a 5V/9V/12V quick charge output, which is the one I use for my phone, it will charge my phone about 4 times before having to recharge it which takes quite a while, so I usually put it on overnight.
I would certainly recommend a RAVPower bank.
For out at the field use I carry one of these in the car:
https://www.amazon.co.uk/gp/product/B072FPVDWN/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1
I purchased it shortly after getting a DJI Spark (first drone with proprietary batteries). It meant I could use the DJI multi-port charger off the clean 240Volt AC outlet and charge tablets and phones from the USB ports. It also has a 12Volt@10Amp output which has proven useful for powering a FPV ground station, and an air compressor to raise a 60ft pneumatic antenna mast at the end of my garden, where as before I’d travel to the future trying to pump it up with a bicycle pump.
At the moment it’s being used to power a drinking fountain for the cat as there isn’t a suitable power outlet at her feeding station.
Nidge.
I took a punt on this recently, not the most powerful out there but has fast 18w fast charge, it will easily charge the Mavic Mini batteries in their hub, it also has the much more convenient USB C as input.
As others have already said, my main go to are Anker, they do stuff that will power a MacBook so I’m sure the osmo will be no problem, Ive previously used the small mini Ankers to power a gopro on timelapse duty.
https://www.amazon.co.uk/Anker-PowerCore-Essential-High-Capacity-Compatible-Black/dp/B08LG2X98F
Would this be any good for use with the Mini 2 charging hub?
You’d probably not charge all three batteries from that, if that was your intention?
3x Mini 2 batteries total less than 7ah. I’d have hoped a 20ah bank could manage 3?
I use this and it does the job
I stand corrected 
Although it is almost dead after doing 3 Mini batteries (not tired the M2) 20 ish-100% charges, so I don’t buy in to all that bullshit capacity amp stuff
I have a Baseus Power Bank, Portable Charger 30000mAh under £25 i haven’t used it for the Mini 2 batteries yet but i have charged 6 go pro batteries from dead to full and it was still over 50% full
Very much appreciate your thoughts/advice pls.
Is this good enough for off-grid charging your DJI Air 2 batteries: Powkey 100W Portable Power Station 99Wh/ 27000mAh Camping Power Pack,Solar generator with AC/DC/USB/Type C Outlet for Outdoors Camping Travel Fishing Emergency Power Supply Backup Orange : Amazon.co.uk: Garden
Defo not to carry on the backpack. Leave it in the car: It’s 3 lbs ( I got dodgy back:()
Thanks
Interesting topic to read as I just purchased this
with two of these so I can charge two batteries simultaneously.
I drained one of my Air2S batteries to 10 percent to test how long it took to charge and to see how much juice it took.
My thinking was a 20000mAh pack would be able to charge at least 4 3500mhA before it ran flat but one battery on charge took 68% from the battery pack. Is that right? It was pretty fast, doing it in 70 mins but now I’m reluctant to keep it if it’s not going to be able to charge more and a battery and a third from 100% fully charged.
I’m a bit disappointed.
I have this and it charges 3 Mini 2 batteries no worries and on fast charge
https://www.amazon.co.uk/dp/B0932PZ857?ref_=cm_sw_r_cp_ud_dp_C6VKK8RF9C86QYHW5XEP
These powerbanks very rarely give out what the manufacturers claim. I just bought one rated at 30600mAh and I would say its actually at least 25% below that. In saying that, I have read that LiPos need broken in, something to do with chemicals that are there to give a longer shelf life. They supposedly break down over a few charge/discharge cycles and it will start giving better performance. I’ve been through 5 or 6 cycles so far but made no difference yet.
All the mAh is based on voltage, so a 5V 1000mAh, would only be 10V 500mAh. So I assume the mini 2 batteries are 4S @ a guess? Let’s asssume 2,000mAh capacity…
You want watts. 5V X 10A = 50W from the power bank. a 16.8V x 2A = 33.6W. So you can charge 1.5V mini 2 batteries (or a 4S 2,000mAh battery). Obviously you don’t ever need to TOTALLY fill a battery, so a 10,000mAh power bank, may get close to charging 3 mini 2 batteries. I don’t know their capacity or voltage TBH. Just remember to convert to watts, and they normally advertise these at mAh based on 5V
To add the Mini 2 uses 2250 mAh 2S. So that’s 8.4V. So needs around 19W. So yeah a 10,000mAh 5V probably do it… Just 