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Powerbook 540c won't run on battery

Is there a way to get my pwerbook to operate on battery pwr again?  Operates fine on adapter, but not at all one battery power.  One battery indicates charged up okay, but when I pull the adapter cord out the screen goes dark.  Neither of the two batteries will make it run, in either battery slot, either separately or together.  Sound like a hardware problem? Could attempting to run it with one bad battery (one may be bad) have messed up some logic so that now even the good battery won't get recognized?
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1 Solution
Zap the PRAM using the freeware, TechTool:

reset your control panels. go.

*note: make sure your battery is completely dead before trying to give it a charge. and make use of the latest Battery Recondition utility from Apple (overnite charge).
BatteryAmnesia (1.4.0b) [180K]

BatteryAmnesia is a utility for any PowerBook that uses a nickel-cadmium (NiCad) battery or Nickel-Hydride (NiMH) battery. Over time, these batteries are susceptible to a "memory effect", which can reduce their battery capacity. The memory effect can be cured by fully discharging the battery before recharging it. Rather than just waiting for your battery to discharge on its own (and putting up with the alert messages that appear), use BatteryAmnesia for a safe, fast and automatic deep discharge.
addendem 2:

ResetPwrMgr (no version # ) [9K]

It seems that Apple invents a new way to reset the power manager on each of its PowerBooks. And even if there was only one way, it is not always easy to remember what it is. This utility does the job for you quick and  easy. I haven't checked it on all PowerBooks, but it works on the ones I have tried.
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