It's not hard at all. Of course a quick circuit isn't hard either.

I'm not worried about how hard or easy it is, though. I'm worried about the 20% of the time I forget to do it. I have literally dozens and dozens of things I need to remember every day. I don't want to remember six more things. I don't want to remember to have to take the battery up several flights of stairs at my building I don't want to remember to bring it back down several flights of stairs. I don't want to remember to turn on the unit. I don't want to remember to turn it back off when I'm done. Even if I only forget a step 3% of the time, because there's six steps:

1) Remember to bring the battery down to the garage.
2) After putting the paniers on the bike, take the battery (or device) out of my pocket, install and turn on.
Ride to work!
3) Turn off the unit.
Work!
Load up bike with panniers, get on bike...
4) Turn on the unit
Ride home!
5) Turn off the unit. Take out batteries (or uninstall unit), put in pocket.
Take off panniers, go upstairs.
6) Put battery on charger

0.97^6 = 83% chance of success in a given day.

This should be a solved solution in the cycling space, but I realize people prefer doing extra work off the bike managing batteries than doing extra work on the bike. I'm the opposite, I'd prefer to do the work on the bike and design the system so that I don't have to remember another 6 things every day. I'm not wrong for wanting what I want, and heck although I'd rather pay someone to provide it to me, I'm even willing to invent and create it myself. I just want to do so in the quickest, 'best' way.