if ur askn if tha widgets use up more battery, then yes, i believe they do. Just cause their always runnin in tha background. I could def b wrong, but thats seems 2 b tha case wit my eris. u probly kno that stuff like tha weather widget can b set 2 how often it updates but not all widgets hav that option.
i had the visbattery app when i was on 1.5. when i did the 2.1ota i saw there was a htc battery wiget so i tossed vis and got the htc one. i used it for a couple days then toss it too because of battery issues. since i droped it i have notticed a little be of battery improvment but not much..
since the update ive been trying everything to get my battery back with not much luck.