try dropping WeatherEye... none of the others should have problems. I just sold my 9000 to someone who installed weathereye and then had a huge leak. Still, with only 15M right after a battery pull, you might have a bad device. Try weatherbug.
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I have noticed a big drop in memory after installing OS 5.0.0.411 on my bold. - From 28mb to 17mb after battery pull. After less than 24 hours, down to 8 mb!
Just tested all combinations.
With or without weathereye or weatherbug, I have same issue like jimfraser. In 24h or even 12h, free memmory drops from ~18 MB to ~6MB. After 5.0.411 it immidiatelly dropped from ~28MB to ~18MB after reboot :(