The batteries age by increasing their internal impedance (voltage drop under load) as well as by capacity (amp-hours) loss. They can show a fairly full gas gauge (reasonable no load voltage) but get drawn down under load quickly-this could explain your machine running only briefly. So after several years the battery distributor's inventory of lithium ions turns into junk if not recharged. The battery can be questionable in as little as one year's time in a hot warehouse. Now, it may be that your intelligent battery is out of sync somehow and in need of some kind of reset, but it's also possible your new battery is shelf stale. Maybe time to try a known good battery, and your new battery in another known good Lombard or Pismo. But before that, it would not hurt to leave it plugged in even if not properly recognized and see if it gets any gradual charging over several days time-perhaps the gas gauge is just lying and the battery nearly empty for all previous tests.
If indeed the battery voltage is slumping under load, you may be able to verify this by operating the machine open and carefully monitoring the exposed terminals with a voltmeter. A half charged battery should be around 11 volts under load, and hang in there for at least an hour. If the voltage slumps quickly towards 9V this is bad news and will trigger the laptop to sleep immediately. Depending on what you mean by runs briefly, you might be able to see the slump on the voltmeter before the sleep process disconnects the battery altogether. If it happens in less than a second you would need a storage scope to make sense of it.
Don't know if a malfunctioning PRAM bat can cause main battery issues; I have seen on the net folks saying it keeps their Pismos from booting if bad and installed, and when removed altogether then the machine will boot, but nothing I recall on main battery non-recognition/malfunctioning on either Lombards or Pismos in my surfing so far. So temporarily removing the PRAM battery and ignoring the pesky time/date message could be a useful experiment for you if you have not already tried disconnecting it.
If indeed the battery voltage is slumping under load, you may be able to verify this by operating the machine open and carefully monitoring the exposed terminals with a voltmeter. A half charged battery should be around 11 volts under load, and hang in there for at least an hour. If the voltage slumps quickly towards 9V this is bad news and will trigger the laptop to sleep immediately. Depending on what you mean by runs briefly, you might be able to see the slump on the voltmeter before the sleep process disconnects the battery altogether. If it happens in less than a second you would need a storage scope to make sense of it.
Don't know if a malfunctioning PRAM bat can cause main battery issues; I have seen on the net folks saying it keeps their Pismos from booting if bad and installed, and when removed altogether then the machine will boot, but nothing I recall on main battery non-recognition/malfunctioning on either Lombards or Pismos in my surfing so far. So temporarily removing the PRAM battery and ignoring the pesky time/date message could be a useful experiment for you if you have not already tried disconnecting it.