Member Avatar for HMC1991

Ive got a Toshiba L300 series laptop, model #PSLB0C-07N08C running Windows 7. About a month ago, my computer showed a big red X on the battery icon, and recommended changing the battery. The model number of the battery was PA3534U-1BRS.

As a result, I went looking for a new battery. A friend of mine who is good with laptop batteries gave me a battery with model #PA3533U-1BRS, suggesting that it should still work on my laptop.

I tried using the new battery, and for 3ish weeks, the laptop enjoyed up to 3hrs of battery life on high performance, and the battery was perfect.

However, for the last week whenever I try working on battery about 45mins in(with mid60%'s to low 70% worth of battery left), the computer abruptly shuts off. No warning, just turns off completely, not even hibernation. When I try to turn it on again, it wont turn until I plug it in, and when its plugged in itll show around 68-72% charge, what I thought was left.

Why isnt the battery discharging fully? Whats wrong? Is there a driver that I should ut in? Or is the battery itself just bad? Any ideas?

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  • Latest Post Latest Post by Maplestory

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Brief expert summary tied to the thread: the symptom described by , together with 's comment about fit, points to a small set of real causes — a failing battery pack (cells or its protection/fuel‑gauge), an intermittent contact, or a reporting mismatch between the pack and the OS/firmware. Sudden shutdown while the system still shows plenty of charge is most commonly caused by cell voltage sag or a protective cutoff inside the pack, not by a Windows power setting.

Practical troubleshooting (in order):

  1. Physically inspect and re‑seat the pack; clean the metal contacts carefully and confirm there is no play in the battery bay. Intermittent contact can mimic a failing pack.
  2. Reset the OS battery driver: in Device Manager, remove the ACPI battery entry and reboot so the driver is reinstalled. This can fix reporting glitches.
  3. Perform one gauge‑calibration cycle: fully charge, run on battery until the system shuts down/hibernates, then charge uninterrupted to 100%. Do this only sparingly — deep discharges age cells.
  4. Run a capacity/health check (Toshiba diagnostics or a reputable battery utility) to compare design capacity vs current full charge and view cycle count. A large capacity drop indicates a worn pack.
  5. Do a controlled discharge test (100% → unplug → run a consistent workload) and note time-to-shutdown and reported percent. If the pack cuts off well above a low percentage repeatedly, the pack is likely defective.

Further notes and safety: BIOS/chipset updates or vendor diagnostics can help rule out firmware bugs, but avoid opening or repairing battery packs — replace or return a failing pack. If the problem remains after the steps above, the battery itself is the most probable cause and replacement (preferably OEM or a reputable vendor) is the recommended next step.

Member Avatar for Maplestory

God , You Should Not Use The Battery Model That Is Not The Same As Yours , Same As Canon And HP Cameras.. You Put The Canon Battery Into The Hp Camera , It Would Spoil... I Have 2 Suggestions That You Could Use To Help Your Computer... Either Call Your Service Provider (Toshiba Number : Could Be Found If You Search In Google) Or Either Try Plugging In the Battery That Is Spoilt... I Think The Connecter Did Not Fit In Properly That's Why Your Battery Did Not Charge Fully.. Maybe When You Move Your Computer , The Battery Might Losen , Why Not Try To Shake your Battery And See If It Moves ... If Not You Could Put A Sticker To Make It Not Shake That Much ... This Is My Only 3 Opinion... I Have No Other Ideas..

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