i didn't install many tweaks or apps from cydia and it was a MASSIVE drain. I don't even use my phone much.
I installed appsync 5+, 5 dock icon, openssh, bigboss iconset, installus, bitesms, activator, coloredknob, winterboard (big bang theory sms sounds), PDAnet, sbsettings and thats all.
Could it be any of these?
EDIT: i'm almost certain it was openssh. I deleted it last night, charged my phone overnight and now my battery is still at 100% where as before it would have been in the mid to low 90's. Still too early to tell but i'm almost positive its that.