Old ericsson T66 battery consumption

i know this is old phone but also i know that someone know the solution. Phone only works for 12 hours with full battery. i tried the battery in other t66 and it goes 3 days. i measured battery terminals it is ok. Resoldered and make balls to cpu, changed charging ic, removed pfo and i tried without pfo and sim card ( i mean i tried with no network. only ”insert sim card” on screen ) but consumption problem again. Help please