I mean a known good battery... And then make sure you really wash that logic board.. I use 91% rubbing alcohol in the tub with a clean new toothbrush to get in the little legs of the ic's... after scrubbing with the alcohol and toothbrush do a rinse with the bottle of alcohol... I usually douse my boards with it and let it sit for a little bit to break down any chemical residue on the board then start with the toothbrush.. As uniserver has mentioned before goo can get under the chips.. make sure all your caps have the right polarity going the right direction..