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Battery will not work on laptop, tried more than 1 battery

Posted on 2006-07-01
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no battery will work in my hp laptop, is this common?
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Question by:BrandonMarker
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rid earned 250 total points
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If the laptop works OK on AC power, but not at all on battery, it could be either the charger circuit gone bad and not providing any charge current to the battery (it remains empty), or a bad connector in the battery bay. Check for foreign matter inside the bay or on the battery contacts. Also, if possible, check and charge the battery in another laptop, then try it in yours.
/RID
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by:BrandonMarker
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There's nothing foreign in there.  I put a multitester to the latop contacts and they all read something.  and on the battery i don't know which to connections to check.  there are 7 different contacts..   the laptop is a HP Pavilion zt1175  and the battery is a f3172a lithium-ion battery module   sanyo p/n : SI-CPL15     14.8V, 3900mAH
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by:rid
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OK, so we may have to go into more detail here:
1. In what way will it not work? It doesn't charge (no indication); battery can't run the machine even if you believe it is full?
2. Does the machine run on AC (with or without battery inserted)?
/RID
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by:BrandonMarker
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oh yeah i have two batterys and neither on of them work....one is the hp brand battery that came with it mentioned above,   the second one is a HI CAPACITY battery  14.8V 4400mAh Li-ion Battery Pack
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by:BrandonMarker
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the computer will work just fine with the ac pluged in it....with the batter in or out if i unplug it, it will shut off immediately as if there was not a battery in the port
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by:rid
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Do these batteries have a charge indicator? If not you need to measure for output voltage, which is a bit cumbersome. If there are 7 terminals, you need to begin with measuring 1-2, then 1-3, 1-4 etc, then 2-3, 2-4 and so on. At some combination you should get the full output voltage reading (14.8 V). If not, you may suspect the batteries are drained, which in turn makes the charging circuits prime suspects here. That would be a motherboard problem.... unless there is a separate power board that can be exchanged.
/RID
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by:BrandonMarker
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ok....neither battery appears to have a charge. tested it with my fluke.    what would the voltage be on the laptop charger connection... i've seen on chargers before that the output might not be as may volts as to what it's charging and i might be alternating between to voltages to charge it......   do you know what voltage  the laptop should be sending to the battery when it's plugged in?  and will it send that charge if the battery isn't in?
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by:rid
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The charger MUST give at least the nominal battery voltage, but in a computer, the charger may be controlled to not deliver, until a battery is present or some similar finesse, so measuring on battery bay terminals may be deceptive (as you were thinking). Perhaps a service center has some contraption to measure these things properly.
/RID
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by:BrandonMarker
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ok...i've actually reformated my computer and just now got the battery meter back on it... and it detects the battery and the battery info like brand and everything.... it's shows that the battery has no 0% charge and is charging
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by:rid
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OK  :) Let's see what happens!
/RID
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by:BrandonMarker
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after about 10 min. the laptop stopped tring to charge the battery
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