okay I have mild bugd related to batterry/charging. I couldn't describe it with details, but I may collect any logs you want (I have full acccess to root account on demand as I suppose most people here, but it is not bad to remind). On medium usage and everyday charging temperature is mostly around 40 celsius. My medium usage includes some usage modem mode (via qtMobileHotspot) some fm transmitter usage and mostly 2G network (display show 2.5g). I've been sure I now place my N900 on right of my laptop (on left is mentioned hot air flow). Temperatures are measured on batterry via bnf on single demand measure (no monitoring) and probably through i2c mechanism (idk how bnf work ExactlY). Extremes measured were 32C on colder day and 52C on high hardware usage plus charging but is mostly stable around 40C - and it's summer here (I say it once I realised only quater of earth have summer now and if I were on zero deegrees north - i couldn't remember the earth line name in english - it would be a special case because it would be even hotter than here - temperatures of atmospheric air are mostly below 35C here).

I have some problems with other batterry metters (mostly default nokia one it got confused about the real batterry temporal capacity a few times but else it showed properly). I do not seem to have instabilities separate from sometimes too big temperature to my flavour (but I haven't properly observed my device before since I haven't batterry i2c script and bq module for batterry was default blacklisted and I haven't touched my modules list).

rest would be later.

PS: my device is mostly on 500mhz so i checked the overclocking or always-100-percent-processor-programs are not the issue.