This is a brand new Acer Aspire Timeline 1820PT replacement battery.

This battery contains the very best Li-ion cells on the market from Samsung. An important specification to look for with rechargeable batteries is the mAh (mili amp hour) rating or Whr (Watt Hour). This battery is rated at 5200 mAh or 58 Whr. This is the highest rating available for a 6 cell battery pack. The higher the mAh rating, the longer your battery will run before it needs to be recharged again. There are no compatibility issues if your existing battery is rated at 4400 or 4800 mAh or a lower Whr. Simply put, more is better. And yes, this battery is probably better than your original!
The other key component inside the battery pack is the computer chip set that contains the program interface with your laptop’s battery meter software and important safety features that monitors when to charge and stop charging your battery. We use Texas Instruments top notch components for this.

All our products carry a full 2 Year warranty and every battery is charged and tested before it ships.
We provide a 30 day money back guarantee if you are not completely satisfied. We are so confident in the quality of our batteries, we will pay for any and all shipping expenses if our product fails to perform in the first 30 days you have our battery, even if it is not our fault.

You can expect about 2 - 3 1/2 hours of run time with this computer battery when new, depending on your energy use. The higher capacity battery cells inside this cartridge have an energy capacity of 5600 mAh. This battery will be compatible with batteries rated at 4400 & 4800 mAh capacities while providing up to 20% more run time.

This battery replaces the Acer Aspire Timeline 1820PT 1820PTZ 1825PT 1825PTZ series laptop batteries and additional machines which are listed at the extreme bottom of this web page.