I have a pavillion zt1135 that is over three years old. The original battery won't take a charge anymore. The pc ran fine from the ac adapter with the dead battery in it or even no battery. The AC power adapter it came with provides 19VDC @ 3950mA. You can run the laptop in your car using an inverter and the AC supply, or get a DC car power supply that is made to be compatible with your pc (about $100). A replacement battery cost me about $100 (last summer).  your lappy model # and you can find sources and pricing for the parts you might need.
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2002 T-Bird, Via SP13000, Travla C158, M1-ATX, 1GB RAM, 120GB 2.5" drive, SlimSlot DVD-RW, XP, RR, Winamp, Xenarc 700TSV, HTC Touch PPC/Phone, BU-353 GPS/iG3, Elmscan OBDII, Griffin PowerMate, 2 Blaupunkt amps, Polk spkrs, 5 sec startup/S3 STR
~Jimmy
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