Very good advice indeed. One tip that I've not seen in the docs,
when using Intelligent Battery Recondition. When you have an unrecognizable battery try launching IBR with the right bay empty. When it asks for a batt. plug it in. IBR should then go into "Extended Precharge". May take 10-15 min. to complete. Alternate with EMMpathy several times untill the values show OK. Out of 10 or so batts. only one failed to recover with this method.
Rick
Second: From my experience, 500 series PowerBook batteries (they have 8 NiMH cells in series of 1800 mah and 1.2V minimum _each_) require at least 4.5 volts for the battery microprocessor to communicate with the notebook charging system. If you take a 500 series battery that only shows 150 milliamps on your voltmeter and the battery will accept a charge from your common battery charger (usually evident after checking for a few seconds with the voltmeter), if the battery will rise to 4.5 to 5 volts, then the battery can be checked by Apple's Intelligent Battery Recondition, VST's EMMpathy, or Linds' iBUS (BU500 Deluxe) and possibly brought to a working charge. Sometimes, the battery will not accept a charge and stay at about 100-300 millivolts, even after 24 hours of charging. The battery is then absolutely dead, that is, all the cells are dead and the battery is a candidate for opening and replacing the cells (All notebook batteries are simply "packs" of normal batteries cells -A, AA, AAA, C, D, 4/5 C, 4/5 D, etc.- (NiCad or NiMH) arranged to give the voltage and amperage necessary to run the notebook.
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