Member Avatar for oldhokie

We just put a new battery into a Compaq Presario 710US. The system sees the battery there but indicates that the battery is at 0% of charge and is charging 0%. It does not charge. According to the meter on the battery if is at at least 25% charge. Any thoughts??

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Short expert addendum:

Because reports a replacement battery behaves the same as the original, treat this like a charging/communication problem in the laptop rather than a simple single bad pack. and already covered contacts and calibration; the next checks should isolate the adapter/charger, the DC jack and the laptop’s charging circuitry or firmware.

Do these tests in order (simple → more invasive):

  1. Verify the AC adapter: read the output printed on its label and measure tip-to-sleeve with a multimeter. If the voltage is far off or collapses when plugged in, swap in a known-good OEM-compatible adapter.
  2. Inspect the DC jack and cable: wiggle the plug while powering on—intermittent power or dim LEDs points to a bad jack or broken wire. If comfortable, open the case and look for cracked solder joints or burn marks near the jack/power section.
  3. Check the battery communications/thermistor path: a smart battery can appear present but report 0% if its data line or temp sensor is open. If possible, try the new pack in another identical machine or use a different compatible pack in this laptop to separate battery vs. laptop.
  4. Do a firmware/EC reset and OS check: remove battery and AC, hold the power button 30–60 seconds, then boot on AC only. Check BIOS or built-in diagnostics for battery health, and run powercfg /batteryreport (Windows) or the vendor diagnostic to see reported capacity/serial/health.

If adapter and jack are good but the laptop still refuses to charge, the likely culprits are a blown protection fuse, a failed charging MOSFET/PMIC, or corrupted EC/BIOS — repair or board-level replacement is usually required. If the machine is under warranty or you lack tools, take it to a service center and mention the tests above so they can avoid repeating troubleshooting. For , the black-screen-with-fans symptom is probably a separate motherboard/GPU issue and should be handled as a distinct repair case.

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Member Avatar for SnowDog

The usual trick we use is to make sure the machine completely discharges on battery, then fully charge it, then fully discharge it. This supposedly resets the 'fuel gauges'.

Does it run on battery at all when you disconnect mains?

Does it run on mains only when the battery is out?


Also, are the pins making contact with the battery? They can sometimes get bent, though I'm not familiar with the layout of this model. I'm sure a friend of mine had an HP machine where the battery had a discharge switch on it - I don't suppose this one does, does it?

I'm not saying it is any of these things, but they're worth checking first before assuming a dud battery.

Member Avatar for oldhokie

I am checking the contact in the morning. The laptop will not work at all on battery. They cystem seems to know the battery is there but registers it as totally uncharged and will not charge it. This is a brand new battery.

Member Avatar for SnowDog

It could still be a dud, though.

On an established system , if the battery is simply taking zero charge we'd usually assume it was either the charging mechanism or the battery and deal with it accordingly (batteries not under warranty, of course).

Just a thought, was the supposedly dead, original battery doing the same thing? That might swing it towards the laptop itself rather than the battery.

Member Avatar for oldhokie

yes the original battery was acting exactly the same way. the only difference is that the "fuel gauge" on the original battery shows it at zero charge

Member Avatar for SnowDog

Mmmm. Makes you wonder, doesn't it?

I think it raises a big question mark over the laptop charging function. Can you get it tested at a store?

Member Avatar for Dancer

We just put a new battery into a Compaq Presario 710US. The system sees the battery there but indicates that the battery is at 0% of charge and is charging 0%. It does not charge. According to the meter on the battery if is at at least 25% charge. Any thoughts??

I have a Compaq Presario 2111 Laptop with the same problem. I thought that the battery had eventually ended it's life of over six years, although it had been used mainly on AC mains power and has never been used on Battery alone. The orange charging LED kept flashing and I had to reset the time and date every time I switched on. I assumed that the Main Battery had lost its charge and also this allowed the CMOS battery to run down. So I purchased a new replacement Laptop battery and fitted it. It made no difference, the charging LED kept flashing as before. I assume now that the actual charging circuit may be at fault. I sprayed contact cleaner into the connectors on the battery and onto the connector on the laptop as well, no change. Any ideas how to change the CMOS battery and faultfind the charging problem?
Thanks Leo
Best Wishes from The Emerald Isle
Brian
www.danceunlimited.org.uk

Member Avatar for Unes

Same here, my Compaq Presario 12XL505 has a battery that does not charge, the lights are on but no charge, then this morning it has a completely black screen. I can hear the fan, the hard drive churning, but a blank scren. Thinking that my screen was gone, I connect my desktop monitor to it, still no screen. Everything worked perfectly yesterday, but today nothing.

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