Charging smaller power station from a larger power station?

Is this a dumb idea or....?

I have the Oupes G6000, and I understand it's recommended to discharge/recharge it every 2 or 3 months. The first time I did the discharge cycle I used a heat gun, an iron, etc to draw down the power.

It worked fine but I got to thinking- if I got a second (probably smaller) power station, is there any reason I couldn't discharge the G6000 into the second power station to charge it up?

And then later, reverse the two and let the second power station charge the G6000 back up?

I know there will be some losses due to conversion efficiency, heat, etc, but it seems like a simple way to keep at least one power station more-or-less ready at any given time.

Is this a dumb idea? It seems to easy and sensible, which always worries me, lol.

What am I overlooking, if anything?