Peter,
Certainly not me, or I'd be working on a fix already.
Does the 25% number come from the battery screen in system settings (I think it is, just double checking).
Do you have lots of constantly syncing folders in those accounts?
Can you try rebooting the device, to see if this a transient glitch, or something the app is running into regularly?
If the latter, could you record the app's debug log for a few hours (capturing a few mail checks), no need to enable "raw data" in this case.