On Dec 10, 2017, Alfred Molon wrote
(in . com):

In ,
sobriquet says...
But that would be kind of inconvenient, as you would need to charge
the battery in the camera and it would be nice if you could use
the camera without being tethered to the powerbank.
So I'd prefer it if I could have the other battery charging in my
pocket with the powerbank while using the camera.

I bought a USB charger for the batteries of my E-M1 II. I could connect
that to a powerbank and recharge the batteries in the field.

But the fact is that I have always four fully charged batteries with me
and I found out that that actually I don't need more than one battery
per day.

Only if I were to do some week-long trekking far away from civilisation
I would need the powerbank.

My X-T2 features USB charging, and I have used my Hyperjuice Power Plug (now
discontinued due to update) to charge that battery. That is quite a useful
feature for road trips away from a power source.
https://blurppy.files.wordpress.com/2012/06/1a123.jpg

However, I also have the booster grip which adds two more batteries to the
camera for a total of three. This gives me more than enough power for most
shoots, and for several days of normal shooting. Unfortunately, while the two
batteries in the grip can be charged when loaded in the grip, that is
facilitated via an AC-9VS plug-in charger, not USB. It does however, provide
the means to charge two batteries simultaneously.

That said, I still carry extra batteries.

--

Regards,
Savageduck