My Remarkable 2 does not maintain a battery charge (when not used / on a shelf) such that each time I see it and think "oh yeah I own this, I should throw it in my bag and use it for journaling today", I pick it up and click the power button and see that it's dead, plug it in to charge it, and then the cycle repeats. Also very heavy for what it is (I have the Type Folio accessory).
Interesting! I have a BOOX Nova Air3 C I bought back when it was the only color option on the market. Now that Remarkable has a color option, I've been wondering if the grass is greener. One thing that's always bugged me about it is, unlike my old Kindle 3G, rather than going to sleep after a period of inactivity, it straight-up powers down. So essentially any time I pick it up to use it I have to wait for it to boot.
BUT -- I can't remember the last time I charged it. It's possible it's still on its original factory charge from a few months ago. As someone whose phone is perpetually below 20% charge I greatly appreciate that feature -- given the choice, I'll always choose "needs to boot" over "needs to charge". Your anecdote has therefore reduced my own buyers' remorse.
Make sure the software is up to date. You can also just do a full shut down if you know you won’t be using it for a hot minute.