Q: can someone  post how toresett he the battery that powers dates of g4 12''

You could try a reset of the computer as follows:

•Resetting PowerBook and iBook 'Power Management Unit' (PMU)

http://support.apple.com/kb/HT1431

•About NVRAM and PRAM:

http://support.apple.com/kb/HT1379

Depending on the model G4 PowerBook and G4 iBook, there may be

a capacitor on the logic board in lieu of a PRAM battery, so if the

Date/Time do not stay set, the Capacitor may have failed, if present.

This capacitor gets power from power adapter, & rechargeable battery.

On models certain portables with a tiny PRAM battery, it may have failed.

•Portable Apple Computers:

Models which Do Not Have a backup battery:

http://support.apple.com/kb/TA25911?view

•PowerBook G4 Computers: How to Identify Different Models:

http://support.apple.com/kb/HT3065

An http://ifixit.com repair guide may be helpful to see the level of difficulty

replacement of a Capacitor, or a pram battery; depending on model.

•PowerBook repair guides - ifixit:

http://www.ifixit.com/Device/PowerBook

•Apple Portables: Calibrating your computer's battery for best performance

http://support.apple.com/kb/HT1490?viewlocale=en_US

•Apple - Support - PowerBook G4:

http://www.apple.com/support/powerbook/

Hopefully some of this helps you.

Good luck & happy computing!