It's def something firmware related as this problem was happening in earlier version, then fixed, then came back.
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The battery still drains, but not nearly as fast. Though it shouldn't be draining at all given the screen isn't on and Wi-Fi is in airplane mode. I have a feeling it's still trying to sync or call out to cloud services that aren't activated.
I have to put it into airplane mode when I leave the office as it will rapidly eat the battery if I don't
Mine drains excessively fast since their later firmware revisions. I've had mine since 2021.
Originally it would last 2 solid weeks with regular daily use.
Whatever the updates did to the Wi-Fi, it relentlessly consumes the battery. Even if the unit is idle in my bag and the Wi-Fi is on, I'll lose 40%.
If the unit is asleep, the Wi-Fi should be off and not aggressively searching for a network.
I love my RM2 and it's one of the best work tools I have, but I'm not keen on needing to be near a charger when not in the office.
Keep your good battery life. They trashed the Wi-Fi and whatever cloud shit it started doing when it's supposed to be asleep.